Perpendicular to the vertical; parallel to the plane of the horizon; level, flat. / (marketing) Relating to horizontal markets / (archaic) Pertaining to the horizon.

A horizontal component of a structure. / (geology) Horizon. / A Tasmanian shrub or small tree whose main trunk tends to lean over and grow horizontally, Anodopetalum biglandulosum

(astrophysics) The gravitational sphere of a black hole within which the escape velocity is greater than the speed of light. / (by extension) A point of no return.

(idiomatic) An apparent gift, that has substantial associated costs or drawbacks, especially a gift that does not fit perfectly with the recipient's wants or needs.

(countable) A plant of the mustard family, Armoracia rusticana. / (uncountable) A pungent condiment made from the root of the plant.

Hard or bony, like an animal's horn. / Having the hard consistency and pale colour of an animal's horn. / Having horns. / (slang, informal) Sexually aroused. / (slang, informal) Sexually arousing.

(archaic) Bristling, rough, rugged. / Causing horror or dread. / Offensive, disagreeable, abominable, execrable.

A sport where horses and their jockeys compete to race around a track the fastest.

A competitive race for horses carrying jockeys; often the subject of betting / An exciting and arduous competition (as in a political campaign).

(uncountable) Power derived from the motion of a horse.