sea slug

noun

1

: sea cucumber

2

: a naked marine gastropod

specifically : nudibranch

Examples of sea slug in a Sentence

Recent Examples on the Web

Some of this year’s winners and honorable mentions included tiny jellyfish larvae swimming inside water droplets, a colorful sea slug wiggling along and many different forms of cells exploring their microscopic worlds. — Adrianne Morales, Washington Post, 16 Sep. 2026

The next night, Sinot and Larsson landed on a pink dorid nudibranch sea slug as their inspo for the evening. — Kara Nesvig, Allure, 3 Aug. 2026

Land slugs can carry rat lungworm, a parasite that can cause serious neurological disease in humans, and many sea slugs contain defensive toxins acquired from their prey. — Encyclopedia Britannica, 10 July 2026

The tide pools around Haystack and elsewhere along Cannon Beach are extraordinary, with colorful sea stars, anemones, crabs, snails, coral, sponges, and sea slugs. — Kara Williams, USA Today, 25 Apr. 2026

Word History

First Known Use

1779, in the meaning defined at sense 1

Rhymes for sea slug

• debug
• humbug
• prodrug
• unplug
• antidrug
• mealybug
• multidrug
• chug
• doug
• drug
• dug
• hug

Kids Definition

sea slug

noun

1

: sea cucumber

2

: any of several marine mollusks that have no shell