plural of horse opera

(simile) To work very hard; to toil.

(BDSM) A BDSM apparatus consisting of a triangular frame to which a person can be tied for flogging.

(medicine, especially serotherapy) Any of several medical regimens that introduce sex hormones to the body to replace lost or unavailable ones.

A hormone that acts upon non-endocrine organs and tissues for the purposes of promoting cellular growth, differentiation, and survival. Often confused with tropic hormones.

plural of scimitar-horned oryx

plural of slender-horned gazelle

plural of hickory horned devil

A Citheronia regalis moth in its caterpillar stage.

Any of several large carnivorous frogs, of the genus Megophrys, that have elongated "eyebrows" / Any of the genus Phrynosoma of horned lizards, especially the Texas horned lizard.