English dictionary caulk meaning and definition Definition and meaning of caulk at MeaningMonkey.org. caulk meaning and definition in the English Dictionary. CAULK nounDefinition of caulk (noun)a waterproof filler and sealant that is used in building and repair to make watertightsynonyms: caulkingCAULK verbDefinition of caulk (verb)seal with caulking"caulk the window"synonyms: calk Source: Princeton University Wordnet
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