Noah Webster
Thum
THUM, noun The short thick finger of the human hand, or the corresponding member of other animals. [The common orthography is corrupt. The real word is thum ]
THUMB
THUM, , verb transitive To handle awkwardly; to play with the fingers; as, to thum over a tune.
1. To soil with the fingers.
THUMB
THUM, verb intransitive To play on with the fingers.
THUMB'-BAND
THUM'-BAND , noun [thum and band.] A twist of any thing as thick as the thum