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hydrosome

[hahy-druh-sohm]

noun Zoology.

the entire body of a compound hydrozoan.

Origin:
1860–65; hydro- (combining form representing hydra) + -some³

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

So is invertebrate. Does it mean:

pertaining to creatures without a backbone

invertebrate phylum with characteristic stinging structures

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Collins

World English Dictionary

hydrosome or hydrosoma (ˈhaɪdrəˌsəʊm, ˌhaɪdrəˈsəʊmə)

—n
	zoology the body of a colonial hydrozoan

[C19: from hydro-, from hydra + -some³]

hydrosoma or hydrosoma

—n

[C19: from hydro-, from hydra + -some³]

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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hydrosome

hy·dro·some