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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.)
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(US) Any of several spiny mammals, such as the porcupine, that are similar to the hedgehog.
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(military) Ellipsis of Czech hedgehog: an antitank obstacle constructed from three steel rails.
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(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.
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(Australia) A type of chocolate cake (or slice), somewhat similar to an American brownie.
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A form of dredging machine.
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Certain flowering plants with parts resembling a member of family Erinaceidae
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The edible fungus Hydnum repandum.
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A kind of electrical transformer with open magnetic circuit, the ends of the iron wire core being turned outward and presenting a bristling appearance.
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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.
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(differential geometry) A type of plane curve; see Hedgehog (geometry).
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(chiefly philosophy) Someone who has one big overarching personal philosophy or worldview.