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sea slug

American

noun

a nudibranch.

sea slug British

noun

any of various shell-less marine gastropod molluscs, esp those of the order Nudibranchia See nudibranch

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

sea slug Scientific

Any of various colorful marine gastropods of the suborder Nudibranchia, lacking a shell and gills but having fringelike projections that serve as respiratory organs.
Also called nudibranch

Etymology

Origin of sea slug

First recorded in 1770–80

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

sea slug

The breakthrough came after he contacted a sea slug expert online.

From Science Daily ● May 27, 2026

Over two decades ago, researchers spotted a mysterious sea slug swimming more than 8,000 feet deep in the Monterey Bay.

From Los Angeles Times ● Nov. 14, 2024

“They spend their lives floating on the ocean surface upside-down, and swallow air to help them stay afloat,” says Ángel Valdés, a sea slug specialist at California State Polytechnic University.

From National Geographic ● Feb. 7, 2024

Vicky Barlow was poking around the pools of Falmouth when she found the rainbow sea slug, usually found in warmer waters.

From BBC ● May 15, 2023

Depending on whim and availability, guests to Buckland’s house might be served baked guinea pig, mice in batter, roasted hedgehog, or boiled Southeast Asian sea slug.

From "A Short History of Nearly Everything" by Bill Bryson

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