The middle part of a nightmare, by implication the scariest part, with no end in prospect; the state of being in a nightmare.

plural of nightbird

A Eurasian species of nightshade with black berries, Solanum nigrum, of Europe. / Solanum americanum (American black nightshade) of much of North America

Any of the genus Circaea of low inconspicuous perennial plants, found in damp, shady places.

Wearing a nightcap. / (law) (of a warrant) that can be executed any time, as opposed to non-nightcapped, that can only be executed during the daytime on business days

simple past tense and past participle of nightcap

(archaic, euphemistic) A prostitute who looks for clients on the streets. / (fantasy) A vampire.

(only in combinations) Someone or something who does something for a certain number of nights

A bird, the Eurasian blackcap (Sylvia atricapilla).

(dated) A frog.