American Heritage® Dictionary of the English Language, Fourth Edition
- n. Any of various echinoderms of the class Echinoidea, having a soft body enclosed in a round, symmetrical, calcareous shell covered with long spines.
Century Dictionary and Cyclopedia
- n. An echinoid; any member of the Echinoidea; a sea-egg or seahedgehog. Many of the leading forms have popular designations or vernacular book-names, as heart-urchins, Spatangidæ; helmet-urchins, Galeritidæ; shield-urchins, Scutellidæ; turban-urchins, Cidaridæ. The common green sea-urchin of New England is Strongylocentrotus drobachiensis (figured under the generic word). A purple sea-urchin is Arbacia punctulata. Toxopneustes franciscorum is a Californian sea-urchin used for food by Indians, and the common European one figured under Echinus is classic in the annals of gastronomy. The species here figured is flatter and less prickly than usual; still flatter ones are those known as cake-urchins, sand-dollars, etc. (See
sanddollar.) Some sea-urchins have spines several inches long, and in others the spines become heavy clubs. Sea-urchins, like sea-anemones, are common objects on most sea-coasts, and their dry tests, usually lacking the spines, are often of beautiful tints. See Echinus, also cuts under ambulacrum, Ananchytes, cake-urchin. Cidaris, Clypeastridæ, Echinoidea, Echinometra, Echinothuriidæ, Echinus, Encope, lantern, petalosllchous, and Strongylocentrotus.
- n. Any of many marine echinoderms, of the class Echinoidea, commonly found in shallow water, having a complex chewing structure named Aristotle's lantern
GNU Webster's 1913
- (Zoöl.) Any one of numerous species of echinoderms of the order Echinoidea.
- n. shallow-water echinoderms having soft bodies enclosed in thin spiny globular shells
- sea + urchin (meaning hedgehog), due to the similarity in appearance to the hedgehog. (Wiktionary)
“FIGURE 9.3 Schematic drawing of a developmental gene regulatory network for sea urchin endomesoderm.”
“Kernels in general can be expected to have a degree of complexity similar to that for sea urchin endomesoderm, so we can infer that other kernels also were designed.”
These user-created lists contain the word ‘sea urchin’.
race relations, rack bar, rack-raking machine, radial drainage, radial flow to a ..., radial gate, radial gate with ..., radial tyre, radial velocity, radial velocity o..., radial water coll..., radial-gate weir and 4474 more...
The collocations below consist of nouns only. Noun-noun collocations are extremely frequent in science (just think of the names of species, chemical compounds or "scientist+invention" type collocat...
When you're underwater, what do you see or experience? Let's dive...
(Here's a cute little related list called Fishful Thinking...)
Being a list of words with the phrase "figured under" in their definitions.
Creatures that lived in prehistoric times and still live today (which would be most of them). Loosely interpreted to include animals like the armadillo, which is a surviving genus of a larger group...
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