Wing transom

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(Naut.) the uppermost transom of the stern; - called also main transom.
- J. Knowles.

See also: Wing

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
The 21-inch wing transom aids in hull lift, enabling the boat to plane fast in shallow water.