adjective Building Trades, Machinery.
(of a beam or rail) having a convex underside.
Origin of fish-bellied
First recorded in 1825–35
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for fish-bellied
Historical Examples of fish-bellied
The malleable rails were of the kind called "fish-bellied," and weighed 28 lbs.
The malleable rails were of the kind called “fish-bellied,” and weighed 28 lbs.Lives of the Engineers