Infix /(?)/

imp. & p. p. Infixed; p. pr. & vb. n. Infixing

1. To set; to fasten or fix by piercing or thrusting in; as, to infix a sting, spear, or dart.

   The fatal dart a ready passage found, And deep within her heart infixed the wound.

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.

1. Something infixed. [R.]
2. An element that is inserted into the body of an elemt which it threby modifies, as a letter within a word. (Grammar)