Webster's English Dictionary

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horn

horn \'ho.(*)rn\ \-l*s\ \-.li-k\ n [ME, fr. OE; akin to OHG horn, L cornu, 
   Gk keras] often attrib  1a1: one of the paired bony processes that arise 
   from the upper part of the  head of many ungulate mammals, that function 
   chiefly as weapons, and that in cattle and related forms are usu. present 
   in both sexes and are unbranched and permanent with a bony core anchored to 
   the skull and a sheath of horn and in deer are solid deciduous bony 
   outgrowths usu. branching and usu. present only in the male 1a2: a part 
   like an animal's horn attributed esp. to the devil  1b: a natural 
   projection or excrescence from an animal resembling or sugges tive of a 
   horn 1c1: the tough fibrous material consisting chiefly of keratin that 
   covers o r forms the horns of cattle and related animals, hooves, or other 
   horny parts (as claws or nails) 1c2: a manufactured product (as a plastic) 
   resembling horn  1d: a hollow horn used to hold something  2: something 
   resembling or suggestive of a horn : as  2a: one of the curved ends of a 
   crescent  2b: a sharp mountain peak  2c: a beak-shaped part of an anvil  
   2d: a high pommel of a saddle  3a: an animal's horn used as a wind 
   instrument  3b: a brass wind instrument; specif : FRENCH HORN  3c: a usu. 
   electrical device that makes a noise like that of a horn  4: a source of 
   strength  - horn.less aj