| plethodont | (noun) mostly terrestrial salamanders that breathe through their thin moist skin; lay eggs in moist places on land; rarely enter water | Synonyms: lungless salamander |
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| plethora | (noun) extreme excess | Synonyms: embarrassment, overplus, superfluity |
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| plethoric | (adjective) excessively abundant | Synonyms: overabundant, rife |
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| plethysmograph | (noun) a measuring instrument for measuring changes in volume of a part or organ or whole body (usually resulting from fluctuations in the amount of blood it contains) | - |
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