v. & n.
v.tr. 1 (often foll. by in) a fix (a thing in another). b impress (a fact etc. in the mind). 2 Gram. insert (a formative element) into the body of a word.
n. Gram. a formative element inserted in a word. infixation n.
[ L infigere infix- (as IN-(2), FIX): (n.) after prefix, suffix ]