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. [1913 Webster]
AMB Advanced Memory Buffer (IC, RAM, FB-DIMM)