v (intransitive, stative) To suffer pain; to be the source of, or be in, pain, especially continued dull pain; to be distressed.
v (transitive, literary, rare) To cause someone or something to suffer pain.
n Continued dull pain, as distinguished from sudden twinges, or spasmodic pain.
n (obsolete or historical) Parsley.
n A language spoken by the Yi people of South-Western China.
n Rare spelling of aitch. [The name of the Latin-script letter H.]
n (biochemistry) Abbreviation of acetylcholinesterase. [(biochemistry) An enzyme that catalyzes the hydrolysis of the neurotransmitter acetylcholine into choline and acetic acid.]