Amb- \Amb-\, Ambi- \Am*bi-\ [L. prefix ambi-, amb-, akin to Gr. ?, Skr. abhi, AS. embe, emb, OHG. umbi, umpi, G. um, and also L. ambo both. Cf. Amphi-, Both, By.]

A prefix meaning about, around; -- used in words derived from the Latin.

Source: Webster's Revised Unabridged Dictionary (1913)