| psi | (noun) the 23rd letter of the Greek alphabet | - |
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| (noun) a unit of pressure | Synonyms: pounds per square inch |
| psilocin | (noun) a hallucinogenic compound obtained from a mushroom | Synonyms: psilocybin |
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| (noun) a substituted tryptamine alkaloid and a serotonergic psychedelic substance, present in most psychedelic mushrooms together with its phosphorylated counterpart psilocybin. | Synonyms: psilocine, psilocyn, psilotsin |
| psilocine | (noun) a substituted tryptamine alkaloid and a serotonergic psychedelic substance, present in most psychedelic mushrooms together with its phosphorylated counterpart psilocybin. | Synonyms: psilocin, psilocyn, psilotsin |
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| psilocybin | (noun) a hallucinogenic compound obtained from a mushroom | Synonyms: psilocin |
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| psilocyn | (noun) a substituted tryptamine alkaloid and a serotonergic psychedelic substance, present in most psychedelic mushrooms together with its phosphorylated counterpart psilocybin. | Synonyms: psilocin, psilocine, psilotsin |
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| psilomelane | (noun) a mineral consisting of hydrated basic oxide of manganese and barium; a source of manganese | - |
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| psilophyte | (noun) any plant of the order Psilophytales: a savannah plant | - |
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| psilophyton | (noun) any plant or fossil of the genus Psilophyton | - |
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| psilosis | (noun) falling out of hair | - |
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| (noun) a chronic disorder that occurs in tropical and non-tropical forms and in both children and adults; nutrients are not absorbed; symptoms include foul-smelling diarrhea and emaciation | Synonyms: sprue, tropical sprue |
| psilotsin | (noun) a substituted tryptamine alkaloid and a serotonergic psychedelic substance, present in most psychedelic mushrooms together with its phosphorylated counterpart psilocybin. | Synonyms: psilocin, psilocine, psilocyn |
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| psittacosaur | (noun) primitive dinosaur actually lacking horns and having only the beginning of a frill; long hind limbs and short forelimbs; may have been bipedal | Synonyms: psittacosaurus |
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| psittacosaurus | (noun) primitive dinosaur actually lacking horns and having only the beginning of a frill; long hind limbs and short forelimbs; may have been bipedal | Synonyms: psittacosaur |
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| psittacosis | (noun) infectious disease of birds | Synonyms: parrot disease |
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| (noun) an atypical pneumonia caused by a rickettsia microorganism and transmitted to humans from infected birds | Synonyms: ornithosis, parrot fever |