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mortar

noun [U] (MIXTURE)
 
 
/ˈmɔː.tər/ US  /ˈmɔːr.tɚ/

Definition

a mixture of sand, water, and cement or lime that is used to fix bricks or stones to each other when building wallsPlastering
(Definition of mortar noun (MIXTURE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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