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grass sponge

American  

noun

  1. a large, dark brown, commercial sponge, Spongia graminea, of Florida, the West Indies, and the Gulf of Mexico.

Etymology

Origin of grass sponge

An Americanism dating back to 1870–75

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.