| parapsychologist | (noun) someone who studies the evidence for such psychological phenomena as psychokinesis and telepathy and clairvoyance | - |
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| parapsychology | (noun) phenomena that appear to contradict physical laws and suggest the possibility of causation by mental processes | Synonyms: psychic phenomena, psychic phenomenon |
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| paraquat | (noun) a poisonous yellow solid used in solution as a herbicide | - |
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| paraquet | (noun) any of numerous small slender long-tailed parrots | Synonyms: parakeet, paroquet, parrakeet, parroket, parroquet |
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| parasail | (noun) parachute that will lift a person up into the air when it is towed by a motorboat or a car | - |
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| parasailing | (noun) gliding in a parasail | Synonyms: paragliding |
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| parasitaemia | (noun) a condition in which parasites are present in the blood | Synonyms: parasitemia |
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| parasite | (noun) an animal or plant that lives in or on a host (another animal or plant); it obtains nourishment from the host without benefiting or killing the host | - |
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| (noun) a follower who hangs around a host (without benefit to the host) in hope of gain or advantage | Synonyms: leech, sponge, sponger |
| parasitemia | (noun) a condition in which parasites are present in the blood | Synonyms: parasitaemia |
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| parasitic | (adjective) of or pertaining to epenthesis | Synonyms: epenthetic |
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| (adjective) relating to or caused by parasites | Synonyms: parasitical |
| (adjective) of plants or persons; having the nature or habits of a parasite or leech; living off another | Synonyms: bloodsucking, leechlike, parasitical |
| parasitical | (adjective) relating to or caused by parasites | Synonyms: parasitic |
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| (adjective) of plants or persons; having the nature or habits of a parasite or leech; living off another | Synonyms: bloodsucking, leechlike, parasitic |
| parasitically | (adverb) in a parasitic manner | - |
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| parasiticidal | (adjective) capable of expelling or destroying parasitic worms | Synonyms: anthelminthic, anthelmintic, helminthic |
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| parasitism | (noun) the relation between two different kinds of organisms in which one receives benefits from the other by causing damage to it (usually not fatal damage) | - |
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| parasol | (noun) a handheld collapsible source of shade | Synonyms: sunshade |
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| parasympathetic | (adjective) of or relating to the parasympathetic nervous system | - |
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| (noun) originates in the brain stem and lower part of the spinal cord; opposes physiological effects of the sympathetic nervous system: stimulates digestive secretions; slows the heart; constricts the pupils; dilates blood vessels | Synonyms: parasympathetic nervous system |
| parasympathomimetic | (adjective) having an effect similar to that resulting from stimulation of the parasympathetic nervous system | - |
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| parathion | (noun) a colorless and odorless toxic oil used as an insecticide | - |
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| parathormone | (noun) hormone synthesized and released into the blood stream by the parathyroid glands; regulates phosphorus and calcium in the body and functions in neuromuscular excitation and blood clotting | Synonyms: parathyroid hormone |
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| parathyroid | (noun) any one of four endocrine glands situated above or within the thyroid gland | Synonyms: parathyroid gland |
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| paratrooper | (noun) a soldier in the paratroops | Synonyms: para |
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| paratroops | (noun) infantry trained and equipped to parachute | - |
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| paratyphoid | (noun) any of a variety of infectious intestinal diseases resembling typhoid fever | Synonyms: paratyphoid fever |
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| parazoan | (noun) primitive multicellular marine animal whose porous body is supported by a fibrous skeletal framework; usually occurs in sessile colonies | Synonyms: poriferan, sponge |
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