Webster's English Dictionary

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thorn

thorn \'tho.(*)rn\ \'tho.(*)rnd\ \'tho.(*)rn-l*s\ n [ME, fr. OE; akin to 
   OHG dorn thorn, Skt trsub-dot>nsub-] often attrib dot>a grass, blade of 
   grass 1: a woody plant bearing a sharp impeding process (as briers, 
   prickles, or  spines); esp : any of a genus (Crataegus) of the rose family 
   2a: a sharp rigid process on a plant; specif : a short, indurated,  
   sharp-pointed, and leafless branch 2b: any of various sharp spinose 
   structures on an animal  3: something that causes distress or irritation  
   4: the runic letter <thorn> used in Old English and Middle English for  
   either of the sounds of Modern English th (as in thin, then) - thorned aj