any marine bivalve of the family Arcidae, especially of the genus Arca, characterized by a heavy shell with a toothed hinge and a deep, boatlike inner surface.
FOR POSTERITY’S SAKE, TAKE THIS WORD OF THE DAY QUIZ!
Are words your bailiwick? Take the latest quiz on the words from July 6 to July 12 to find out.
Question 1 of 7
Origin of ark shell
First recorded in 1850–55
Words nearby ark shell
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020