Glossary · Nouns · P
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TermTypeDefinitionClassificationsUpdated
Pyloric StenosisnounMWEnarrowing of the pyloric sphincter that blocks the passage of food from the stomach into the duodenumverified
Pyloric ValvenounMWEthe sphincter muscle of the pylorus that separates the stomach from the duodenumverified
Pyloric VeinnounMWEreceives veins from the upper surfaces of the stomach and empties into the portal veinverified
Pyracanthnounany of various thorny shrubs of the genus Pyracantha bearing small white flowers followed by hard red or orange-red berriesverified
Pyralid MothnounMWEusually tropical slender-bodied long-legged moth whose larvae are crop pestsverified
Pyramid SchemenounMWEa fraudulent scheme in which people are recruited to make payments to the person who recruited them while expecting to receive payments from the persons they recruitverified
Pyramidal BonenounMWEa wrist bone that articulates with the pisiform and hamate and lunate bonesverified
Pyramidal Motor SystemnounMWEany of the important motor nerves on each side of the central nervous system that run from the sensorimotor areas of the cortex through the brainstem to motor neurons of the cranial nerve nuclei and the ventral root of the spinal cordverified
Pyramidal TractnounMWEany of the important motor nerves on each side of the central nervous system that run from the sensorimotor areas of the cortex through the brainstem to motor neurons of the cranial nerve nuclei and the ventral root of the spinal cordverified
Pyramidingnouna fraudulent business practice involving some form of pyramid scheme e.g., the chain of distribution is artificially expanded by an excessive number of distributors selling to other distributors at progressively higher wholesale prices until retail prices are unnecessarily inflatedverified
Pyrethrumnounspring-flowering garden perennial of Asiatic origin having finely divided aromatic leaves and white to pink-purple flowersverified
Pyriform AreanounMWEpear-shaped neural structure on either side of the brain in the rhinencephalonverified
Pyriform LobenounMWEpear-shaped neural structure on either side of the brain in the rhinencephalonverified
Pyroelectricitynoungeneration of an electric charge on certain crystals (such as tourmaline) as a result of a change in temperatureverified
Pyrogallic AcidnounMWEa toxic white lustrous crystalline phenol used to treat certain skin diseases and as a photographic developerverified
Pyrogallolnouna toxic white lustrous crystalline phenol used to treat certain skin diseases and as a photographic developerverified
Pyrographynounthe act of producing drawings on wood or leather by using heated tools or a fine flameverified
Pyroligneous AcidnounMWEa red-brown liquid formed in distillation of wood which contains acetic acid, methanol, acetone, wood oils, and tarsverified
Pyrometric ConenounMWEa pyrometer consisting of a series of cones that melt at different temperaturesverified
Pyrosisnouna painful burning sensation in the chest caused by gastroesophageal reflux (backflow from the stomach irritating the esophagus)verified
Pyroxenenounany of a group of crystalline silicate mineral common in igneous and metamorphic rocksverified
Pyroxylinnounhighly flammable nitrocellulose used in making collodion and plastics and lacquersverified
Pyroxylinenounhighly flammable nitrocellulose used in making collodion and plastics and lacquersverified
Pyruvic AcidnounMWEa colorless acid formed as an important intermediate in metabolism or fermentationverified
Pyxienouncreeping evergreen shrub having narrow overlapping leaves and early white star-shaped flowersverified