plural of swallow hole

plural of pot-hole

plural of sludge hole

The hand-hole, or manhole, in a steam boiler, by means of which sediment can be removed.

(physics) A vacant position in the atomic lattice of a conductor where an electron would normally be present

(slang) The state of dissociation from (and lack of control over) the body commonly experienced after taking relatively high doses of the drug ketamine.

plural of swimming hole

(chiefly Australia, New Zealand) An area for swimming in a stream or river.

(military slang) A concealed place where one can hide in safety, especially during a war; a dugout.

plural of funk hole