Pollex

(n.) 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.

Thesaurus Entries

annulary, arch, binary digit, bit, character, cipher, clubfoot, dactylion, dog, extremity, fetlock, figure, finger, foot, forefinger, forefoot, forepaw, harefoot, heel, hoof, index, index finger, instep, integer, little finger, medius, middle finger, minimus, notation, number, numeral, numero, pad, pastern, patte, paw, pedal extremity, pedes, pes, pied, pinkie, pollex, pug, ring finger, sign, sole, splayfoot, symbol, thumb, toe, tootsy, trotter, ungula, whole number