Webster's English Dictionary

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hedgehog

hedge.hog \'hej-.ho.g, -.ha:g\ n 1a: any of a genus (Erinaceus) of Old 
   World nocturnal insectivorous m ammals having both hair and spines that 
   they present outwardly by rolling themselves up 1b: any of several spiny 
   mammals (as a porcupine)  2: a military defensive obstacle or stronghold