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.
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            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.]
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         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.]
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   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.
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            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]

The Free On-line Dictionary of Computing (19 January 2023):

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)