(idiomatic) A short and sudden period of cold weather.

A period of hostile relations between rivals where direct open warfare between them is largely undesired and avoided.

Having an unregulated body temperature; ectothermic. / Lacking emotion or compunction.

(pathology) A chronic abscess that forms slowly, without pain, heat or inflammation.

(law enforcement, slang) A criminal investigation that has not been solved after a considerable time but remains “on the books” and may be reopened when new evidence appears.

(metallurgy) Of metal: brittle at low temperatures.

(idiomatic) In a ruthless and unfeeling manner, particularly as applied to first-degree murder committed without provocation and with malice aforethought.

(pathology) A small bump (namely a vesicle) on the lips resulting from infection by herpes simplex viruses (mostly HHV1 but also HHV2).

plural of cold sore

The tap (of a pair) that produces cold water (the other being the hot tap)