[ bahy-oh-hurm ]
/ ˈbaɪ oʊˌhɜrm /

noun Geology.

a carbonate rock formation, in the form of an ancient reef or hummock, consisting of the fossilized remains of corals, algae, mollusks, and other sedentary marine life, and commonly surrounded by rock of a different lithology.

Origin of bioherm

1925–30; bio- + -herm < Greek hérma sunken rock, reef

Related forms

bi·o·her·mal, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for biohermal


/ (ˈbaɪəʊˌhɜːm) /


a mound of material laid down by sedentary marine organisms, esp a coral reef
the fossilized remains of such a mound

Word Origin for bioherm

C20: from bio- + Greek herma submerged rock
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