The Collaborative International Dictionary of English v.0.48:

Bottom \Bot"tom\ (b[o^]t"t[u^]m), n. [OE. botum, botme, AS.
   botm; akin to OS. bodom, D. bodem, OHG. podam, G. boden,
   Icel. botn, Sw. botten, Dan. bund (for budn), L. fundus (for
   fudnus), Gr. pyqmh`n (for fyqmh`n), Skr. budhna (for
   bhudhna), and Ir. bonn sole of the foot, W. bon stem, base.
   [root]257. Cf. 4th Found, Fund, n.]
   1. The lowest part of anything; the foot; as, the bottom of a
      tree or well; the bottom of a hill, a lane, or a page.
      [1913 Webster]

            Or dive into the bottom of the deep.  --Shak.
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   2. The part of anything which is beneath the contents and
      supports them, as the part of a chair on which a person
      sits, the circular base or lower head of a cask or tub, or
      the plank floor of a ship's hold; the under surface.
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            Barrels with the bottom knocked out.  --Macaulay.
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            No two chairs were alike; such high backs and low
            backs and leather bottoms and worsted bottoms. --W.
                                                  Irving.
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   3. That upon which anything rests or is founded, in a literal
      or a figurative sense; foundation; groundwork.
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   4. The bed of a body of water, as of a river, lake, sea.
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   5. The fundament; the buttocks.
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   6. An abyss. [Obs.] --Dryden.
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   7. Low land formed by alluvial deposits along a river;
      low-lying ground; a dale; a valley. "The bottoms and the
      high grounds." --Stoddard.
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   8. (Naut.) The part of a ship which is ordinarily under
      water; hence, the vessel itself; a ship.
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            My ventures are not in one bottom trusted. --Shak.
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            Not to sell the teas, but to return them to London
            in the
            same bottoms in which they were shipped. --Bancroft.
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   Full bottom, a hull of such shape as permits carrying a
      large amount of merchandise.
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   9. Power of endurance; as, a horse of a good bottom.
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   10. Dregs or grounds; lees; sediment. --Johnson.
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   At bottom, At the bottom, at the foundation or basis; in
      reality. "He was at the bottom a good man." --J. F.
      Cooper.

   To be at the bottom of, to be the cause or originator of;
      to be the source of. [Usually in an opprobrious sense.]
      --J. H. Newman.
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            He was at the bottom of many excellent counsels.
                                                  --Addison.
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   To go to the bottom, to sink; esp. to be wrecked.

   To touch bottom, to reach the lowest point; to find
      something on which to rest.
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The Collaborative International Dictionary of English v.0.48:

Bottom \Bot"tom\, n. [OE. botme, perh. corrupt. for button. See
   Button.]
   A ball or skein of thread; a cocoon. [Obs.]
   [1913 Webster]

         Silkworms finish their bottoms in . . . fifteen days.
                                                  --Mortimer.
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The Collaborative International Dictionary of English v.0.48:

Bottom \Bot"tom\, a.
   Of or pertaining to the bottom; fundamental; lowest; under;
   as, bottom rock; the bottom board of a wagon box; bottom
   prices.
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   Bottom glade, a low glade or open place; a valley; a dale.
      --Milton.
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   Bottom grass, grass growing on bottom lands.

   Bottom land. See 1st Bottom, n., 7.
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The Collaborative International Dictionary of English v.0.48:

Bottom \Bot"tom\, v. t.
   To wind round something, as in making a ball of thread.
   [Obs.]
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         As you unwind her love from him,
         Lest it should ravel and be good to none,
         You must provide to bottom it on me.     --Shak.
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The Collaborative International Dictionary of English v.0.48:

Bottom \Bot"tom\, v. t. [imp. & p. p. Bottomed (?); p. pr. &
   vb. n. Bottoming.]
   [1913 Webster]
   1. To found or build upon; to fix upon as a support; --
      followed by on or upon.
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            Action is supposed to be bottomed upon principle.
                                                  --Atterbury.
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            Those false and deceiving grounds upon which many
            bottom their eternal state].          --South.
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   2. To furnish with a bottom; as, to bottom a chair.
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   3. To reach or get to the bottom of. --Smiles.
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The Collaborative International Dictionary of English v.0.48:

Bottom \Bot"tom\, v. i.
   1. To rest, as upon an ultimate support; to be based or
      grounded; -- usually with on or upon.
      [1913 Webster]

            Find on what foundation any proposition bottoms.
                                                  --Locke.
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   2. To reach or impinge against the bottom, so as to impede
      free action, as when the point of a cog strikes the bottom
      of a space between two other cogs, or a piston the end of
      a cylinder.
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WordNet (r) 3.0 (2006):

bottom
    adj 1: situated at the bottom or lowest position; "the bottom
           drawer" [ant: side(a), top(a)]
    2: the lowest rank; "bottom member of the class"
    n 1: the lower side of anything [syn: bottom, underside,
         undersurface]
    2: the lowest part of anything; "they started at the bottom of
       the hill"
    3: the fleshy part of the human body that you sit on; "he
       deserves a good kick in the butt"; "are you going to sit on
       your fanny and do nothing?" [syn: buttocks, nates,
       arse, butt, backside, bum, buns, can,
       fundament, hindquarters, hind end, keister,
       posterior, prat, rear, rear end, rump, stern,
       seat, tail, tail end, tooshie, tush, bottom,
       behind, derriere, fanny, ass]
    4: the second half of an inning; while the home team is at bat
       [syn: bottom, bottom of the inning] [ant: top, top of
       the inning]
    5: a depression forming the ground under a body of water; "he
       searched for treasure on the ocean bed" [syn: bed,
       bottom]
    6: low-lying alluvial land near a river [syn: bottomland,
       bottom]
    7: a cargo ship; "they did much of their overseas trade in
       foreign bottoms" [syn: bottom, freighter, merchantman,
       merchant ship]
    v 1: provide with a bottom or a seat; "bottom the chairs"
    2: strike the ground, as with a ship's bottom
    3: come to understand [syn: penetrate, fathom, bottom]

Moby Thesaurus II by Grady Ward, 1.0:

197 Moby Thesaurus words for "bottom":
   argosy, arse, ass, at bottom, backbone, backside, bark, basal,
   base, basement, basic, basically, basin, basis, baygall, bed,
   bedrock, behind, belly, best, boat, bog, bottom glade, bottomland,
   bottommost, bottoms, breech, bucket, buffalo wallow, bum, butt,
   buttocks, can, cause, channel, chutzpah, coulee, courage, craft,
   cut, dale, dell, depths, derriere, dingle, duff, end, essentiality,
   essentially, establish, everglade, fanny, fen, fenland, floor,
   foot, footing, found, foundation, foundational, fundament,
   fundamentally, gameness, gap, gill, giveaway, glade, glen,
   gluteus maximus, grit, ground, groundwork, grove, guts, gutsiness,
   guttiness, half-price, heart, heart of oak, heinie, hindquarters,
   hog wallow, holm, hooker, hulk, hull, in reality, in truth,
   intervale, intestinal fortitude, keel, keister, leviathan, low,
   lower strata, lowermost, lowest, lowest level, lowest point,
   lunar rill, marais, marish, marked down, marrow, marsh, marshland,
   meadow, mere, mettle, mettlesomeness, mire, moor, moorland, morass,
   moss, moxie, mud, mud flat, nadir, nerve, nethermost, nub,
   ocean bottom, origin, packet, pass, peat bog, pith, pluck,
   pluckiness, posterior, prat, predicate, primary, quagmire,
   quicksand, quintessence, quintessential, radical, ravine, really,
   rear, rear end, reduced, rest, rock-bottom, rump, sacrificial,
   salt marsh, seat, ship, slashed, slob land, slough, sole, sough,
   soul, source, spirit, spunk, spunkiness, stamina, stay,
   stout heart, strath, stuff, substance, substructure, sump, swale,
   swamp, swampland, taiga, toughness, trench, trough, true grit,
   truly, tub, tuchis, tush, tushy, underbelly, underlying,
   underlying level, undermost, underneath, underpinning, underside,
   vale, valley, vessel, virtuality, wadi, wallow, wash, watercraft



The Free On-line Dictionary of Computing (30 December 2018):

bottom

    The least defined element in a given domain.

   Often used to represent a non-terminating computation.

   (In LaTeX, bottom is written as \perp, sometimes with the
   domain as a subscript).

   (1997-01-07)