hermit crab

noun

: any of numerous chiefly marine small decapod crustaceans (especially families Diogenidae, Paguridae, and Parapaguridae) having soft asymmetrical abdomens and occupying the empty shells of gastropods

Illustration of hermit crab

Illustration of hermit crab

Examples of hermit crab in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Smaller critters — hermit crabs, lightning whelks and snails — skittered along the seafloor. Max Chesnes, The Orlando Sentinel, 6 Feb. 2026 One of Rocha’s favorite discoveries was a hermit crab that uses clam-like shells as its home. Laura Paddison, CNN Money, 19 Dec. 2025 The tide pools bring back fond childhood memories for me of exploring the rocks and discovering all the little sea creatures: hermit crabs, sea anemones and so much more. Carlos Rico, San Diego Union-Tribune, 11 Nov. 2025 The hermit crab benefits from this partnership with the anemone by achieving a larger body size than its relatives. Laura Baisas, Popular Science, 5 Nov. 2025 See All Example Sentences for hermit crab

Word History

First Known Use

1735, in the meaning defined above

Time Traveler
The first known use of hermit crab was in 1735

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Cite this Entry

“Hermit crab.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hermit%20crab. Accessed 13 Feb. 2026.

Kids Definition

hermit crab

noun
: any of various small crabs that occupy empty mollusk shells

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