In locomotive boilers, a feed water check valve placed on the top of the boiler drum. This encourages rapid mixing of the cold feedwater with the hot steam, reducing the risk of thermal shock to the heated parts of the boiler.

plural of top feed

A geographical region encompassing the northernmost portion of the Northern Territory of Australia.

plural of top-notcher

(colloquial) Something excellent or first-rate.

plural of red-top

(vulgar, slang, UK) breasts

A nitromethane-based motor fuel, used in top-fuel dragsters.

Alternative form of mizzentop

Alternative form of mizzentop