Definitions

from The Century Dictionary.

  • noun The movable joint of the forceps of the lobster, crawfish, or crab; a dactylopodite.
  • noun In anatomy, the innermost digit of the hand or foot, when there are five; the thumb or the great toe, especially the thumb, the great toe being usually distinguished as pollex pedis, or hallux.
  • noun In zoology: The innermost digit of the fore limb only, when there are five; the digit that corresponds to the human thumb.
  • noun The thumb of a bird; the short digit bearing the alula or bastard wing, regarded as homologous with either the human thumb or the forefinger.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Anat.) The first, or preaxial, digit of the fore limb, corresponding to the hallux in the hind limb; the thumb. In birds, the pollex is the joint which bears the bastard wing.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun The first, or preaxial, digit of the forelimb, corresponding to the hallux in the hind limb; the thumb. In birds, the pollex is the joint which bears the bastard wing.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun the thick short innermost digit of the forelimb

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Latin, thumb, big toe.]

Examples

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