Webster's Revised Unabridged Dictionary · 1913

Abaft

Abaft (ȧ*bȧft") , preposition

[Prefix a- on + Old English baft, baften, biaften, Anglo-Saxon beaftan; be by + aftan behind. See After, Aft, By.]

(Nautical) Behind; toward the stern from; as, abaft the wheelhouse.
Collocations (1)
Abaft the beam , See under Beam.

Abaft , adverb

(Nautical) Toward the stern; aft; as, to go abaft.