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Glossary of Invertebrates Terms
beginning with letter H
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heartworm Tweet Definition of heartworm Like Definition of heartworm on Facebook
noun
  1. A parasitic organism that afflicts dogs.
  2. The condition caused by this organism.
helminthology Tweet Definition of helminthology Like Definition of helminthology on Facebook
noun
  1. The study of helminths (parasitic worms); helminthology is a branch of zoology.
hermit crab Tweet Definition of hermit crab Like Definition of hermit crab on Facebook
noun
  1. A type of crab which salvages empty seashells or other objects to shelter and protect their soft abdomens.
hookworm Tweet Definition of hookworm Like Definition of hookworm on Facebook
noun
  1. Any of various parasitic bloodsucking worms which cause disease. They have hooked mouthparts and enter their hosts by boring through the skin.
horseshoe crab Tweet Definition of horseshoe crab Like Definition of horseshoe crab on Facebook
noun (horseshoe crab, horseshoe crabs)
  1. A type of chelicerate arthropod, of the genus Limulus, resembling a crab.
Hydra Tweet Definition of Hydra Like Definition of Hydra on Facebook
proper noun
  1. (greekmyth) A mythological serpent with seven heads, slain by Hercules as one of his twelve labours. Also called the Lernaean Hydra.
  2. (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.
  3. (astronomy) The name of one of Pluto's moons. (Named 21 June 2006).

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