What does amb- or ambi- mean?
The definition of amb- and ambi-
Amb-, Am*bi-.
Etym: [L. prefix ambi-, amb-, akin to Gr. 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.