One of the mysteries of the English language finally explained.
Designating a larval stage of a crinoid at which it resembles a crinoid of the genus Pentacrinus in having a stalk and a calyx consisting of five plates.
A larval crinoid which resembles a crinoid of the genus Pentacrinus.
Mid 19th century; earliest use found in Proceedings of the Royal Society of London. From scientific Latin Pentacrinus + -oid, perhaps after crinoid.
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