horseshoe crab

noun

: any of several closely related marine arthropods (family Limulidae and order Xiphosura) with a broad crescentic cephalothorax, six pairs of legs, and a spikelike tail
especially : one (Limulus polyphemus) of coastal waters from Maine to the Yucatán Peninsula

Note: The horseshoe crab is often said to have five pairs of legs since the first pair is greatly reduced in size and used mainly for feeding. All the legs of the horseshoe crab end in claws except for the last pair of legs which have leaflike expansions used mainly for pushing.

… a horseshoe crab … is a Swiss army knife of jointed limbs—for walking, swimming, grasping, shredding, and defending. Carl Zimmer
… the horseshoe crab has changed little since an ancestor was fossilized 150 million years ago … National Geographic

called also king crab

Examples of horseshoe crab in a Sentence

Recent Examples on the Web Interactive programming ranges from tide pools where kids can touch sea anemones, seastars, bat rays, and horseshoe crabs to daylong whale-watching excursions. Sunset Magazine, 10 Sep. 2024 Additionally, horseshoe crabs have a reproductive strategy that includes spawning in large numbers, which increases the chances of survival of offspring despite environmental fluctuations. Scott Travers, Forbes, 7 Sep. 2024 Instead, the sea-bug taco likely got around as modern horseshoe crabs do: by swimming upside down. Mindy Weisberger, CNN, 30 July 2024 With its dome shape and spiky tail, the horseshoe crab might at first look like a fearsome visitor from another planet. Oli Turner, The Christian Science Monitor, 1 July 2024 See all Example Sentences for horseshoe crab 

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'horseshoe crab.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1797, in the meaning defined above

Time Traveler
The first known use of horseshoe crab was in 1797

Dictionary Entries Near horseshoe crab

Cite this Entry

“Horseshoe crab.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/horseshoe%20crab. Accessed 11 Oct. 2024.

Kids Definition

horseshoe crab

noun
: any of several closely related arthropods that have a broad crescent-shaped united head and thorax and a tail resembling a spike

More from Merriam-Webster on horseshoe crab

Last Updated: - Definition revised
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