Definitions for oral fissure
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Princeton's WordNet
mouth, oral cavity, oral fissure, rima oris(noun)
the opening through which food is taken in and vocalizations emerge
"he stuffed his mouth with candy"
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"oral fissure." Definitions.net. STANDS4 LLC, 2013. Web. 25 May 2013. <http://www.definitions.net/definition/oral fissure>.