| 单词 | scum-cock |
| 释义 | > as lemmasscum-cock scum-cock n. a cock in a steam-boiler for the removal of surface scum from the water without loss of pressure. ΚΠ 1888 Lockwood's Dict. Mech. Engin. Scum Cock, a cock placed in the side of a marine boiler for the purpose of getting rid of the dirt and scum which are carried to the surface of the water. 1891 W. S. Hutton Steam-boiler Constr. 318 When a scum-cock..is employed it is to blow off scum from the surface of the water in a steam-boiler. < as lemmas |
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