A spellingbee word! = thumb in Latin

Also means big toe. From Lewis and Short: "To close down the thumb (premere) was a sign of approbation; to extend it (vertere, convertere; pollex infestus), a sign of disapprobation." Premo 'to press (down)' and verto 'to turn'. Or as we say today, thumbs up and or down. (Reminds me of a 7Up soda drink in India called Thums Up.

I think Big Toe is usually Hallux.

Hallux valgus is a bunion.

(Valgus is pointing inward; cf. varus, pointing outward. Both are also used for knees - knock-kneed is genu valgum, bowlegged is genu varum. Genu = knee, as you might gather, as in genuflect = bend the knee.)