English to English

noun (n)

• the thick short innermost digit of the forelimb(noun.body)

  Synonym:
  thumb
  

  source: wordnet30
• 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.(noun)

  source: webster1913