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osculum
-ose (1)
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osmoregulator

os·mo·reg·u·la·tor [ òzmō réggyə làytər ] (plural os·mo·reg·u·la·tors)


noun 
Definition:
 
self-regulating organism: an organism that can maintain a concentration of dissolved substances inside its body different from that of its surroundings

[Mid-20th century. <osmosis]
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