Source : Webster's Revised Unabridged Dictionary (1913)

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.