Definitions from Wiktionary ( )

▸ noun:  A small mammal, of the family Erinaceidae or subfamily Erinaceinae. (spiny hedgehogs, the latter characterized by their spiny back and often by the habit of rolling up into a ball when attacked.)
▸ noun:  (US) Any of several spiny mammals, such as the porcupine, that are similar to the hedgehog.
▸ noun:  (informal, military, historical) A spigot mortar-type of depth charge weapon from World War II that simultaneously fires a number of explosives into the water to create a pattern of underwater explosions intended to attack submerged submarines.
▸ noun:  (Australia) A type of chocolate cake (or slice), somewhat similar to an American brownie.
▸ noun:  A form of dredging machine.
▸ noun:  Certain flowering plants with parts resembling a member of family Erinaceidae
▸ noun:  Medicago intertexta, the pods of which are armed with short spines.
▸ noun:  Retzia capensis of South Africa.
▸ noun:  The edible fungus Hydnum repandum.
▸ noun:  A kind of electrical transformer with open magnetic circuit, the ends of the iron wire core being turned outward and presenting a bristling appearance.
▸ noun:  A way of serving food at a party, consisting of a half melon or potato etc. with individual cocktail sticks of cheese and pineapple stuck into it.
▸ noun:  (differential geometry) A type of plane curve; see Hedgehog (geometry).
▸ verb:  (military) To make use of a hedgehog barricade as a defensive maneuver.
▸ verb:  To array with spiky projections like the quills of a hedgehog.
▸ verb:  (ambitransitive) To curl up into a defensive ball.
▸ noun:  (military) Ellipsis of Czech hedgehog: an antitank obstacle constructed from three steel rails. [(military) A static antitank and anti-landing craft obstacle, widely used during World War II, constructed from three mutually-perpendicular steel rails connected in the form of a tripod.]

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