ēmissārĭum, ii, n. [emitto],
an outlet : lacūs, a drain , Cic. Fam. 16, 18; Plin. 33, 4, 21, § 75; Suet. Claud. 20, 32: vomicae, Scrib. Comp. 229; cf. collectionis, id. ib. 206.
ēmissārium ī, n emitto, an outlet, drain . ...
An Elementary Latin Dictionary