Physogastrism is a characteristic of the `queens` of certain species of eusocial insects such as termites and ants, in which the abdomen swells in order to hold enlarged ovaries, thus increasing fecundity. ...
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http://en.wikipedia.org/wiki/Physogastrism
physogastrism, physogastric, physogastry In certain insects, a condition in which the abdomen becomes distended by the growth of fat bodies or other organs.
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http://www.wordinfo.info/words/index/info/view_unit/1662/
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