(number theory) Any of a series of numbers formed from the sum of the reciprocals of consecutive natural numbers

(linguistics, Optimality Theory) A situation where one input-to-output mapping pair receives a set of constraint violations that is a proper subset of the set of constraint violations received by a different input-output pair.

plural of harmonic oscillator

The reduced hydrated form of harmine.

(organic chemistry) An alkaloid, 1-methyl-4,9-dihydro-3H-pyrido[3,4-b]indol-7-ol, found in the seeds of the harmal plant

Peganum harmala, a perennial plant of the family Nitrariaceae.

(chiefly psychology) The committing of acts that cause harm.

(organic chemistry) An alkaloid related to harmine.

(very rare) One who harms.

plural of harmonic number