sea slug

noun

1. a nudibranch.

sea slug

noun

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

sea slug

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

Word History and Origins

Origin of sea slug¹

First recorded in 1770–80

Example Sentences

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

A nature enthusiast and her father have made a colourful discovery of a sea slug usually found in the Mediterranean in a rock pool in south Devon, a wildlife trust says.

From BBC

To gain a better insight into the ecology of the animals, the researchers exploited the fact that small shell-less sea slugs from the Rhodopidae family feed on placozoans.

From Science Daily

A new species of sea slug has been discovered in UK waters.

From BBC

“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