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calyptrogen

[kuh-lip-truh-juhn]

noun Botany.

the histogen layer that develops into the root cap.

Origin:
1880–85; calyptro- (combining form of calyptra) + -gen

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Calyptrogen is always a great word to know.

So is multicellular. Does it mean:

composed of several cells

phylum of green, nonvascular, seedless plants comprised of true mosses, hornworts and liverworts

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Collins

World English Dictionary

calyptrogen (kəˈlɪptrədʒən)

—n
	a layer of rapidly dividing cells at the tip of a plant root, from which the root cap is formed. It occurs in grasses and many other plants

[C19: from calyptra + -gen]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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calyptrogen

ca·lyp·tro·gen