مدر

مَمْدَرَةٌ ذ (S, K) and مِمْدَرَةٌ, (K,) which latter is extr. [with respect to form], (TA,) or مَمْدُرَةٌ, like مَقْبُرَةٌ, (A,) A place in which is [مَدَر, or] clay, or loam, or mud, unmixed with sand, (K,) prepared for closing the interstices of the stones of watering-troughs or tanks; (TA;) a place from which مَدَر is taken for that purpose. (S.) See 4.