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hormone any of various substances secreted by the cells of the body that circulate in the bloodstream and produce specific, usu. stimulating effects in certain receptive organs or tissues. [2 definitions]
horn the hard, bony, hollow growths that extend, usu. in a pair, from the head of certain mammals such as cows and deer. [6 definitions]
hornbeam any of various shrubs or trees of the birch family having hard white wood covered by smooth gray bark, or the wood of this plant.
hornbill any of several tropical birds having a large curved bill, usu. with a horny bulge.
hornblende a greenish to black mineral formed in granite rock.
hornbook formerly, a child's primer for reading or math, consisting of a page of material covered by a transparent sheet of horn and framed. [2 definitions]
horned lizard see horned toad.
horned owl any of several owls having earlike tufts of feathers, esp. the great horned owl.
horned pout a common bullhead catfish, esp. the brown bullhead.
horned toad any of several insect-eating lizards of western North America and Mexico, having spiny scales covering the body and hornlike spines on the head.
horned viper a highly poisonous snake of Africa, having a hornlike protrusion above each eye; asp.
hornet any of several large stinging insects that live in colonies and build large, round, papery nests; wasp.
hornless combined form of horn.
horn of plenty see cornucopia.
hornpipe a musical wind instrument whose mouthpiece and bell are usu. made of ox horn. [3 definitions]
hornworm the caterpillar of any of several hawk moths, which has a thornlike projection on the rear segment.
hornwort any of several aquatic plants that have whorled leaves and unisexual flowers.
horny having horns or hornlike projections. [4 definitions]
horologe any device used for keeping time, such as a sundial or clock.
horologist one who is expert in the study of time or timepieces. [2 definitions]
horology the science or study of measuring time. [2 definitions]