AMBULACRUM

ambulacrum

(noun) one of the five areas on the undersurface of an echinoderm on which the tube feet are located

Source: WordNet® 3.1


Etymology

Noun

ambulacrum (plural ambulacrums or ambulacra)

(of an echinoderm) A row of pores for the protrusion of appendages such as tube feet.

Source: Wiktionary


Am`bu*la"crum, n.; pl. Ambulacra. Etym: [L., an alley or covered way.] (Zoöl.) (a) One of the radical zones of echinoderms, along which run the principal nerves, blood vessels, and water tubes. These zones usually bear rows of locomotive suckers or tentacles, which protrude from regular pores. In star fishes they occupy the grooves along the under side of the rays. (b) One of the suckers on the feet of mites.

Source: Webster’s Unabridged Dictionary 1913 Edition



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Word of the Day

22 December 2024

SUNGLASSES

(noun) (plural) spectacles that are darkened or polarized to protect the eyes from the glare of the sun; “he was wearing a pair of mirrored shades”


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