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Webster 1828 Edition

Noun.

A small fresh water fish of Brazil, about the size of the minnow, much esteemed for food.

piaba

First-person singular (yo) imperfect indicative form of piar.
Formal second-person singular (usted) imperfect indicative form of piar.
Third-person singular (él, ella, also used with usted^?) imperfect indicative form of piar.