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-tomy

Origin

a combining form meaning “cutting, incision” of an organ, “excision” of an object, as specified by the initial element (appendectomy; lithotomy); also occurring in abstract nouns corresponding to adjectives ending in -tomous (dichotomy).

Compare -tome, tomo-, -tomous.

Origin:
representing Greek -tomia; see -tome, -y³

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

So is lollapalooza. Does it mean:

a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.

an extraordinary or unusual thing, person, or event; an exceptional example or instance.

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Collins

World English Dictionary

-tomy

—*n combining form*
	indicating a surgical cutting of a specified part or tissue: lobotomy

[from Greek -tomia; see -tome]

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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Etymonline

Word Origin & History

-tomy

comb. form meaning "a cutting," from Gk. -tomia "a cutting of," from tome "a cutting, section" (see tome).

American Heritage

Medical Dictionary

-tomy suff.
Act of cutting; incision: gastrotomy.

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