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Pronunciation: mi'oyd


  1. Resembling muscle.
  2. One of the fine, contractile, threadlike protoplasmic elements found in certain epithelial cells in lower animals.
  3. A contractile part of retinal cones in certain fish and amphibia. In mammals, the myoid is the inner part of the inner segment of rods and cones; it contains microtubules, the Golgi apparatus, endoplasmic reticulum, and ribosomes, but no myofibrils.

[myo- + G. eidos, appearance]

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.