An aquatic animal, such as a mollusk or crustacean, that has a shell or shell-like exoskeleton.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "shellfish" in a sentence
"The Health Department currently prohibits, and will continue to prohibit the sale of raw shellfish from a mobile food cart."
"Domoic acid is produced by the diatom Nitzschia pungens and has been isolated in shellfish from Prince Edward Island, Canada. 10 This toxin is responsible for amnestic shellfish poisoning (ASP) in humans causing symptoms of gastroenteritis and neurotoxicity."
"I guess if you asked me what I would not order, not that I do not enjoy the diversion of flavors but I guess that a pairing of Fino Amontillado Sherry and shellfish is not my preference."