The Collaborative International Dictionary of English v.0.48:

Ambo \Am"bo\, n.; pl. Ambos. [LL. ambo, Gr. ?, any rising, a
   raised stage, pulpit: cf. F. ambon.]
   A large pulpit or reading desk, in the early Christian
   churches. --Gwilt.
   [1913 Webster]

WordNet (r) 3.0 (2006):

ambo
    n 1: a platform raised above the surrounding level to give
         prominence to the person on it [syn: dais, podium,
         pulpit, rostrum, ambo, stump, soapbox]