| pleochroism | (noun) the phenomenon of different colors appearing when certain crystals are viewed from different directions | - |
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| pleomorphism | (noun) (biology) the appearance of two or more distinctly different forms in the life cycle of some organisms | - |
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| (noun) (chemistry) the existence of different kinds of crystal of the same chemical compound | Synonyms: polymorphism |
| pleonasm | (noun) using more words than necessary | - |
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| pleonaste | (noun) a dark-colored spinel containing iron | Synonyms: ceylonite |
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| pleopod | (noun) one of the paired abdominal appendages of certain aquatic crustaceans that function primarily for carrying the eggs in females and are usually adapted for swimming | Synonyms: swimmeret |
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