What is the chamber of a canal lock; also, a caisson or a cofferdam. Coffer dam. (Engin.) See Cofferdam, in the Vocabulary. -- Coffer fish. (Zoöl.) See Cowfish called?

coffer — The chamber of a canal lock; also, a caisson or a cofferdam. Coffer dam. (Engin.) See Cofferdam, in the Vocabulary. -- Coffer fish. (Zoöl.) See Cowfish. (Webster's 1913.)

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