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2 definitions found
 for Hedgehog
From The Collaborative International Dictionary of English v.0.48 :

  Hedgehog \Hedge"hog`\, n.
     1. (Zool.) A small European insectivore ({Erinaceus
        Europ[ae]us), and other allied species of Asia and
        Africa, having the hair on the upper part of its body
        mixed with prickles or spines. It is able to roll itself
        into a ball so as to present the spines outwardly in every
        direction. It is nocturnal in its habits, feeding chiefly
        upon insects.
        [1913 Webster]
  
     2. (Zool.) The Canadian porcupine.[U.S]
        [1913 Webster]
  
     Medicago+({Medicago+intertexta">3. (Bot.) A species of Medicago ({Medicago intertexta),
        the pods of which are armed with short spines; --
        popularly so called. --Loudon.
        [1913 Webster]
  
     4. A form of dredging machine. --Knight.
        [1913 Webster]
  
     5. (Elec.) A variety of transformer with open magnetic
        circuit, the ends of the iron wire core being turned
        outward and presenting a bristling appearance, whence the
        name.
        [Webster 1913 Suppl.]
  
     6. (Mil.) a defensive obstacle having pointed barbs extending
        outward, such as one composed of crossed logs with barbed
        wire wound around them, or a tangle of steel beams
        embedded in concrete used to impede or damage landing
        craft on a beach; also, a position well-fortified with
        such defensive obstacles.
        [PJC]
  
     Hedgehog caterpillar (Zool.), the hairy larv[ae] of several
        species of bombycid moths, as of the Isabella moth. It
        curls up like a hedgehog when disturbed. See Woolly
        bear, and Isabella moth.
  
     Hedgehog fish (Zool.), any spinose plectognath fish, esp.
        of the genus Diodon; the porcupine fish.
  
     Hedgehog grass (Bot.), a grass with spiny involucres,
        growing on sandy shores; burgrass ({Cenchrus
        tribuloides).
  
     Hedgehog rat (Zool.), one of several West Indian rodents,
        allied to the porcupines, but with ratlike tails, and few
        quills, or only stiff bristles. The hedgehog rats belong
        to Capromys, Plagiodon, and allied genera.
  
     Hedgehog shell (Zool.), any spinose, marine, univalve shell
        of the genus Murex.
  
     Hedgehog thistle (Bot.), a plant of the Cactus family,
        globular in form, and covered with spines
        ({Echinocactus).
  
     Sea hedgehog. See Diodon.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  hedgehog
      n 1: relatively large rodents with sharp erectile bristles
           mingled with the fur [syn: porcupine, hedgehog]
      2: small nocturnal Old World mammal covered with both hair and
         protective spines [syn: hedgehog, Erinaceus europaeus,
         Erinaceus europeaeus]

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