a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.

a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.

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Facebook plans to add a series of photo filters to its mobile application in the coming months.

I've been thinking about this photo for a couple of days because the ironies it captures are astounding.

Its green banners could be seen above photo shops everywhere.

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Dictionary.com Unabridged

a combining form meaning “light” (photobiology); also used to represent “photographic” or “photograph” in the formation of compound words: photocopy.

Also, especially before a vowel, phot-.

Origin:
< Greek, combining form of phôs (genitive phōtós)

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Link To photo

Collins

World English Dictionary

photo (ˈfəʊtəʊ)

—n , pl -tos
	short for photograph

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

photo

1860, shortening of photograph. The verb is first recorded 1868, from the noun. Photo finish is attested from 1936. Photo opportunity first recorded 1974.

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photo-

comb. form meaning "light" or "photographic," from Gk. photo-, comb. form of phos (gen. photos) "light," from PIE base *bha- "to shine" (see phantasm).

COLLAPSE

American Heritage

Medical Dictionary

photo- or phot-
pref.