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The Collaborative International Dictionary
Prowest

Prow \Prow\, a. [Compar. Prower; superl. Prowest.] [OF. prou, preu, F. preux, fr. L. pro, prod, in prodesse to be useful. See Pro-, and cf. Prude.] Valiant; brave; gallant; courageous. [Archaic]
--Tennyson.

The prowest knight that ever field did fight.
--Spenser.

Wiktionary
prowest

a. (en-superlative of: prow)