(endocrinology) A hormone that is involved primarily in stimulating the release of another hormone.

(archaic) Something a child can ride as though on horseback; a hobby-horse.

(archaic) Astride; mounted on something as though on horseback.

(slang, euphemistic) Sexual intercourse.

(idiomatic) To introduce slyly, to sneak in, to subvert. / (computer security) To install a Trojan horse.

Alternative form of a camel is a horse designed by a committee

(radio) A microwave antenna consisting of an open waveguide of increasing size towards the aperture

A tree of the species Ostrya virginiana (American hophornbeam). / Its wood.

(countable, vulgar, slang) A very large penis. / (uncountable, slang, chiefly military) Sausage such as baloney or salami. / (uncountable, slang) Nonsense, bullshit.

(vulgar, slang) A very large penis.