The Collaborative International Dictionary of English v.0.48:

Runner \Run"ner\, n. [From Run.]
   1. One who, or that which, runs; a racer.
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   2. A detective. [Slang, Eng.] --Dickens.
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   3. A messenger. --Swift.
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   4. A smuggler. [Colloq.] --R. North.
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   5. One employed to solicit patronage, as for a steamboat,
      hotel, shop, etc. [Cant, U.S.]
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   6. (Bot.) A slender trailing branch which takes root at the
      joints or end and there forms new plants, as in the
      strawberry and the common cinquefoil.
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   7. The rotating stone of a set of millstones.
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   8. (Naut.) A rope rove through a block and used to increase
      the mechanical power of a tackle. --Totten.
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   9. One of the pieces on which a sled or sleigh slides; also
      the part or blade of a skate which slides on the ice.
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   10. (Founding)
       (a) A horizontal channel in a mold, through which the
           metal flows to the cavity formed by the pattern;
           also, the waste metal left in such a channel.
       (b) A trough or channel for leading molten metal from a
           furnace to a ladle, mold, or pig bed.
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   11. The movable piece to which the ribs of an umbrella are
       attached.
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   12. (Zool.) A food fish (Elagatis pinnulatus) of Florida
       and the West Indies; -- called also skipjack,
       shoemaker, and yellowtail. The name alludes to its
       rapid successive leaps from the water.
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   13. (Zool.) Any cursorial bird.
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   14. (Mech.)
       (a) A movable slab or rubber used in grinding or
           polishing a surface of stone.
       (b) A tool on which lenses are fastened in a group, for
           polishing or grinding.
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The Collaborative International Dictionary of English v.0.48:

Sailor \Sail"or\, n.
   One who follows the business of navigating ships or other
   vessels; one who understands the practical management of
   ships; one of the crew of a vessel; a mariner; a common
   seaman.
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   Syn: Mariner; seaman; seafarer.
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   Sailor's choice. (Zool.)
   (a) An excellent marine food fish (Diplodus rhomboides,
       syn. Lagodon rhomboides) of the Southern United States;
       -- called also porgy, squirrel fish, yellowtail,
       and salt-water bream.
   (b) A species of grunt (Orthopristis chrysopterus syn.
       Pomadasys chrysopterus), an excellent food fish common
       on the southern coasts of the United States; -- called
       also hogfish, and pigfish.
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The Collaborative International Dictionary of English v.0.48:

Mademoiselle \Ma`de*moi`selle"\, n.; pl. Mesdemoiselles. [F.,
   fr. ma my, f. of mon + demoiselle young lady. See Damsel.]
   1. A French title of courtesy given to a girl or an unmarried
      lady, equivalent to the English Miss. --Goldsmith.
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   2. (Zool.) A marine food fish (Sciaena chrysura), of the
      Southern United States; -- called also yellowtail, and
      silver perch.
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The Collaborative International Dictionary of English v.0.48:

Yellowtail \Yel"low*tail`\, n. (Zool.)
   (a) Any one of several species of marine carangoid fishes of
       the genus Seriola; especially, the large California
       species (Seriola dorsalis) which sometimes weighs
       thirty or forty pounds, and is highly esteemed as a food
       fish; -- called also cavasina, and white salmon.
   (b) The mademoiselle, or silver perch.
   (c) The menhaden.
   (d) The runner, 12.
   (e) A California rockfish (Sebastodes flavidus).
   (f) The sailor's choice (Diplodus rhomboides).
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   Note: Several other fishes are also locally called
         yellowtail.
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WordNet (r) 3.0 (2006):

yellowtail
    n 1: superior food fish of the tropical Atlantic and Caribbean
         with broad yellow stripe along the sides and on the tail
         [syn: yellowtail, yellowtail snapper, Ocyurus
         chrysurus]
    2: game fish of southern California and Mexico having a yellow
       tail fin [syn: yellowtail, Seriola dorsalis]