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dental dam

noun
1.
Also called rubber dam. a thin piece of latex placed over the tooth or teeth being treated during endodontic treatment or other dental work.
2.
a thin piece of latex used to prevent the transfer of bodily fluids during cunnilingus or anilingus.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Contemporary definitions for rubber dam
noun

a piece of latex set in the mouth during dentistry to protect the dentist from fluids

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