| heartworm |
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noun
- A parasitic organism that afflicts dogs.
- The condition caused by this organism.
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| helminthology |
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noun
- The study of helminths (parasitic worms); helminthology is a branch of zoology.
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| hermit crab |
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noun
- A type of crab which salvages empty seashells or other objects to shelter and protect their soft abdomens.
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| hookworm |
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noun
- Any of various parasitic bloodsucking worms which cause disease. They have hooked mouthparts and enter their hosts by boring through the skin.
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| horseshoe crab |
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noun (horseshoe crab, horseshoe crabs)
- A type of chelicerate arthropod, of the genus Limulus, resembling a crab.
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| Hydra |
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proper noun
- (greekmyth) A mythological serpent with seven heads, slain by Hercules as one of his twelve labours. Also called the Lernaean Hydra.
- (constellation) A spring constellation of the northern sky, said to resemble a serpent. It lies just south of the zodiac and contains the star Alphard.
- (astronomy) The name of one of Pluto's moons. (Named 21 June 2006).
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