Definitions
Century Dictionary and Cyclopedia
- n. An encrinite or fossil crinoid of the genus Pentacrinites or family Pentacrinitidæ.
Wiktionary
- n. Any crinoid of the genus Pentacrinites
GNU Webster's 1913
- n. Any species of Pentacrinus.
Examples
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Lists
These user-created lists contain the word ‘pentacrinite’.
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Dudgeon and Dragging
They're not actually from fantasy or science fiction writing, but they certainly sound as though they could have been...
sourcender, zargari, glycyrrhizin, shibboleth, dyschezia, physiocrat, elastomer, skellefteälven, guadalquivir, alluvion, pentacrinite, hydrophyte and 22 more...

chained_bear "A fossil crinoid of the genus Pentacrinus or family Pentacrinitidae, having a five-sided stalk and a calyx consisting of five plates, and known from remains of the Jurassic period." (OED) Sep 8, 2008