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The three rays opposite the madreporite in starfish.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
the three humanities of grammar, rhetoric, and logic, which constituted the first and most important group of the seven liberal arts during the Middle Ages. The trivium was taught in the faculties of arts of universities and at Jesuit colleges.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.