1. a kind of water vessel (udaka DN-a.i.202), made of copper, wood or a fruit (like a calabash, cocoanut, etc., cp. kaṭāha, E. skull) Vin.i.205 (loha˚, kaṭṭha˚, phala˚); Vin.ii.114 (˚kaṭāha of gourd); Ja.iii.430 (udaka˚); Ja.iv.114; Dhp-a.ii.193 (udaka˚)
2. a measure of capacity, esp. used for grain Ja.i.233 (mahā˚), Ja.i.467 (= 4 nāḷi Ja.i.468); Mil.102.

possibly = Sk. tumra swollen (of shape), same root as tumula