(number theory) Any of a sequence of numbers having the property that the sum of the divisors of each, excluding itself, is equal to the next number in the sequence; in the case of the last number of the sequence, the sum of the divisors, excluding that number, is equal to the first number of the sequence.

Synonym of Nakhichevan-on-Don

plural of non-believer

(music) A note sustained in one part, while the other parts move.

The European walnut; the nut of Juglans regia.

(dated) To be hanged.

A small tropical American euphorbiaceous tree (Jatropha curcas) with poisonous seeds, cultivated to produce biodiesel fuel.

A V-shaped neckline on a garment such as a pullover, usually at the front of the garment.

(poetic, obsolete) midnight

plural of number 2 pencil