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mesosome

[ mez-uh-sohm, mes-, mee-zuh-, -suh- ]

noun

  1. the anterior portion of the abdomen in arachnids.
  2. a whorled structure extending inward from the cell membrane in Gram-positive bacteria and containing enzymes for cellular respiration.


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Word History and Origins

Origin of mesosome1

First recorded in 1955–60; meso- + -some 3

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mesoscalemesosphere