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Meaning of whaleback

whale•back

Pronunciation: (hwāl'bak", wāl'-), [key]
— n.
    1. a cargo vessel having a hull with a convex deck.
    2. a deck or cover curving upward.
  1. something shaped like the back of a whale, as a rounded hill or an ocean wave.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.