(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.

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