forefinger UK /ˈfɔːˌfɪŋ.ɡə/US /ˈfɔɹˌfɪŋ.ɡɚ/ noun1 •The index finger: the first finger next to the thumb.He touched me on the arm with his forefinger twice or thrice giving a ghastly nod each time:- […] — 1866 formsforefingers