Definitions for lacrimal sac
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Princeton's WordNet
lacrimal sac, tear sac, dacryocyst(noun)
either of the two dilated ends of the lacrimal ducts at the nasal ends of the eyes that fill with tears secreted by the lacrimal glands
Wiktionary
lacrimal sac(Noun)
The upper dilated end of the tear duct
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"lacrimal sac." Definitions.net. STANDS4 LLC, 2013. Web. 22 May 2013. <http://www.definitions.net/definition/lacrimal sac>.

