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mermaid's wineglass

American  

noun

  1. a colony of green algae, Acetabularia crenulata, of warm seas, having a cup-shaped cap on a slender stalk.

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.