From The Collaborative International Dictionary of English v.0.48 [gcide]:
Infix \In*fix"\, v. t. [imp. & p. p. Infixed; p. pr. & vb. n.
Infixing.] [L. infixus, p. p of infigere to infix; pref.
in- in + figere to fix: cf. F. infixer. See Fix.]
1. To set; to fasten or fix by piercing or thrusting in; as,
to infix a sting, spear, or dart. --Shak.
[1913 Webster]
The fatal dart a ready passage found,
And deep within her heart infixed the wound.
--Dryden.
[1913 Webster]
2. To implant or fix; to instill; to inculcate, as
principles, thoughts, or instructions; as, to infix good
principles in the mind, or ideas in the memory.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Infix \In"fix\, n.
1. Something infixed. [R.] --Welsford.
[1913 Webster]
2. (Grammar) An element that is inserted into the body of an
elemt which it threby modifies, as a letter within a word.
[PJC]
From WordNet (r) 3.0 (2006) [wn]:
infix
n 1: an affix that is inserted inside the word
v 1: put or introduce into something; "insert a picture into the
text" [syn: insert, infix, enter, introduce]
2: attach a morpheme into a stem word