Intro-

·- A prefix signifying within, into, in, inward; as, introduce, introreception, introthoracic.

intro
intrō, adv. [contr. from interō sc. loco]. I Inwardly , internally; on the inside : omnia sana faci...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
intro
intrō (1) adv.* interus; ANA-, to the inside, within, in : intro ad nos venit, T.: intro est itum,...

An Elementary Latin Dictionary