mesosome

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.

Origin:
1955–60; meso- + -some3

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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