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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. n. The anterior division of the thorax of an insect, bearing the first pair of legs.

Century Dictionary and Cyclopedia

  1. n. In Insecta, the first one of the three thoracic somites, which succeeds the head, is succeeded by the mesothorax, and bears the first pair of legs. In descriptions of Coleoptera and Hemiptera the term is often restricted to the broad shield, or pronotum, forming the part of the thorax seen from above. In the Hymenoptera, Diptera, and Lepidoptera the prothorax is generally so small as to be hardly distinguishable. See cuts under Coleoptera, Insecta, mesothorax, and metathorax.
  2. n. See the adjectives.

Wiktionary

  1. n. The anterior part of the insect thorax; it carries the first pair of legs

GNU Webster's 1913

  1. n. The first or anterior segment of the thorax in insects. See Illusts. of butterfly and coleoptera.

WordNet 3.0

  1. n. the anterior part of an insect's thorax; bears the first pair of legs

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‘prothorax’ has been looked up 482 times, added to 2 lists, and has a Scrabble score of 21.