What do a.m. and p.m. stand for?

brain coral

any of several reef-building corals of the genus Meandrina, having a highly convoluted and furrowed surface.
Origin of brain coral
1700-10 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for brain coral
  • Healthy brain coral colony surrounded by typical reef soft corals and macro algae.
  • Shallower portions of the sanctuary are dominated by large, boulder-shaped coral such as brain coral and mountainous star corals.
  • Broken brain coral and rubble resulting from the grounding.
British Dictionary definitions for brain coral

brain coral

a stony coral of the genus Meandrina, in which the polyps lie in troughlike thecae resembling the convoluted surface of a human brain
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
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