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collophane

American  
[kol-uh-feyn] / ˈkɒl əˌfeɪn /
Also collophanite

noun

Mineralogy.

  1. a massive, cryptocrystalline variety of apatite that is the principal component of phosphate rock and fossil bone.

Etymology

Origin of collophane

1915–20; < German Kollophan, equivalent to Greek koll(a) glue + -o- -o- + -phan -phane ( def. )

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.