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biostrome

[bahy-uh-strohm]
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noun Geology.
  1. a bedded, blanketlike sedimentary deposit of organic origin built by marine organisms and including shell beds, flat reefs, and corals.
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Origin of biostrome

1930–35; bio- + Greek strôma layer, bed; see stroma
Related formsbi·o·stro·mal, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for biostrome

biostrome

noun
  1. a rock layer consisting of a deposit of organic material, such as fossils
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Word Origin

C20: from bio- + Greek strōma covering
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012