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Wordnet 3.0

ADVERB (1)

1. at right angles to the length of a ship or airplane;


The Collaborative International Dictionary of English v.0.48:

Abeam \A*beam"\, adv. [Pref. a- + beam.] (Naut.) On the beam, that is, on a line which forms a right angle with the ship's keel; opposite to the center of the ship's side. [1913 Webster]
WordNet (r) 3.0 (2006):

abeam adv 1: at right angles to the length of a ship or airplane