The difference between Hedgehog and Urchin
When used as nouns, hedgehog means a small mammal, of the family erinaceidae or subfamily erinaceinae (, the latter characterized by their spiny back and often by the habit of rolling up into a ball when attacked.), whereas urchin means a mischievous child.
Hedgehog is also verb with the meaning: to make use of a hedgehog barricade as a defensive maneuver.
check bellow for the other definitions of Hedgehog and Urchin
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Hedgehog as a noun:
A small mammal, of the family Erinaceidae or subfamily Erinaceinae (, the latter characterized by their spiny back and often by the habit of rolling up into a ball when attacked.)
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Hedgehog as a noun (US):
Any of several spiny mammals, such as the porcupine, that are similar to the hedgehog.
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Hedgehog as a noun:
A type of moveable military barricade made from crossed logs or steel bars, laced with barbed wire, used to damage or impede tanks and vehicles; Czech hedgehog.
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Hedgehog as a 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.
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Hedgehog as a noun (Australia):
A type of chocolate cake (or slice), somewhat similar to an American brownie.
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Hedgehog as a noun:
A form of dredging machine.
Examples:
"rfquotek Knight"
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Hedgehog as a noun:
Certain flowering plants with parts resembling a member of family Erinaceidae , the pods of which are armed with short spines. of South Africa.
Examples:
"rfquotek Loudon"
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Hedgehog as a 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.
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Hedgehog as a 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.
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Hedgehog as a verb (military):
To make use of a hedgehog barricade as a defensive maneuver.
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Hedgehog as a verb:
To array with spiky projections like the quills of a hedgehog.
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Hedgehog as a verb:
To curl up into a defensive ball.
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Urchin as a noun:
A mischievous child.
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Urchin as a noun:
A street urchin, a child who lives, or spends most of their time, in the streets.
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Urchin as a noun (archaic):
A hedgehog.
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Urchin as a noun:
A sea urchin.
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Urchin as a noun:
A mischievous elf supposed sometimes to take the form of a hedgehog.
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Urchin as a noun:
One of a pair in a series of small card cylinders arranged around a carding drum; so called from its fancied resemblance to the hedgehog.
Examples:
"rfquotek Knight"
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Urchin as a noun (historical):
A neutron-generating device that triggered the nuclear detonation of the earliest plutonium atomic bombs.