| apercu | (noun) a short synopsis | - |
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| apperceive | (verb) perceive in terms of a past experience | - |
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| apperception | (noun) the process whereby perceived qualities of an object are related to past experience | - |
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| apperceptive | (adjective) able to relate new percepts to past experience | - |
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| capercaillie | (noun) large black Old World grouse | Synonyms: capercailzie, horse of the wood, Tetrao urogallus |
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| capercailzie | (noun) large black Old World grouse | Synonyms: capercaillie, horse of the wood, Tetrao urogallus |
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| clapperclaw | (verb) use foul or abusive language towards | Synonyms: abuse, blackguard, shout |
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| (verb) claw with the nails | - |
| hypercalcaemia | (noun) the presence of abnormally high levels of calcium in the blood; usually the result of excessive bone resorption in hyperparathyroidism or Paget's disease | Synonyms: hypercalcemia |
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| hypercalcemia | (noun) the presence of abnormally high levels of calcium in the blood; usually the result of excessive bone resorption in hyperparathyroidism or Paget's disease | Synonyms: hypercalcaemia |
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| hypercalcinuria | (noun) the presence of abnormally high levels of calcium in the urine; usually the result of excessive bone resorption in hyperparathyroidism or osteoporosis | Synonyms: hypercalciuria |
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| hypercalciuria | (noun) the presence of abnormally high levels of calcium in the urine; usually the result of excessive bone resorption in hyperparathyroidism or osteoporosis | Synonyms: hypercalcinuria |
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| hypercapnia | (noun) the physical condition of having the presence of an abnormally high level of carbon dioxide in the circulating blood | Synonyms: hypercarbia |
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| hypercarbia | (noun) the physical condition of having the presence of an abnormally high level of carbon dioxide in the circulating blood | Synonyms: hypercapnia |
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| hypercatalectic | (adjective) (verse) having an extra syllable or syllables at the end of a metrically complete verse or in a metrical foot | - |
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| (noun) (prosody) a line of poetry having an extra syllable or syllables at the end of the last metrical foot | - |
| hypercellularity | (noun) the state of having abnormally many cells | - |
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| hypercholesteremia | (noun) the presence of an abnormal amount of cholesterol in the cells and plasma of the blood; associated with the risk of atherosclerosis | Synonyms: hypercholesterolemia |
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| hypercholesterolemia | (noun) the presence of an abnormal amount of cholesterol in the cells and plasma of the blood; associated with the risk of atherosclerosis | Synonyms: hypercholesteremia |
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| hypercoaster | (noun) a roller coaster that goes up 200 feet or higher and can catapult riders from 0 to 70 mph in 4 seconds by motors originally designed to launch rockets | - |
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| hypercritical | (adjective) inclined to judge too severely | Synonyms: overcritical |
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| hypercriticism | (noun) Excessive or unfairly harsh criticism. | - |
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| imperceptibility | (noun) the property of being imperceptible by the mind or the senses | - |
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| imperceptible | (adjective) impossible or difficult to perceive by the mind or senses | Synonyms: unperceivable |
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| imperceptibly | (adverb) in an imperceptible manner or to an imperceptible degree | Synonyms: unnoticeably |
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| misperceive | (verb) perceive incorrectly | - |
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| operculate | (adjective) having an operculum | Synonyms: operculated |
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| operculated | (adjective) having an operculum | Synonyms: operculate |
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| operculum | (noun) a hard flap serving as a cover for (a) the gill slits in fishes or (b) the opening of the shell in certain gastropods when the body is retracted | - |
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| paperclip | (noun) a wire or plastic clip for holding sheets of paper together | Synonyms: gem clip, paper clip |
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| peppercorn | (noun) pungent seasoning from the berry of the common pepper plant of East India; use whole or ground | Synonyms: pepper |
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| percale | (noun) a fine closely woven cotton fabric | - |
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| perceivable | (adjective) capable of being apprehended or understood | Synonyms: apprehensible, graspable, intelligible, understandable |
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| (adjective) capable of being perceived especially by sight or hearing | - |
| perceive | (verb) become conscious of | - |
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| (verb) to become aware of through the senses | Synonyms: comprehend |
| perceived | (adjective) detected by means of the senses | - |
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| (adjective) detected by instinct or inference rather than by recognized perceptual cues | Synonyms: sensed |
| perceiver | (noun) a person who becomes aware (of things or events) through the senses | Synonyms: beholder, observer, percipient |
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| percent | (noun) a proportion in relation to a whole (which is usually the amount per hundred); ten percent | Synonyms: pct, per centum, percentage |
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| percentage | (noun) assets belonging to or due to or contributed by an individual person or group | Synonyms: part, portion, share |
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| (noun) a proportion in relation to a whole (which is usually the amount per hundred); ten percent | Synonyms: pct, per centum, percent |
| percentile | (noun) (statistics) any of the 99 numbered points that divide an ordered set of scores into 100 parts each of which contains one-hundredth of the total | Synonyms: centile |
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| percept | (noun) the representation of what is perceived; basic component in the formation of a concept | Synonyms: perception, perceptual experience |
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| perceptibility | (noun) the property of being perceptible by the mind or the senses | - |
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| perceptible | (adjective) capable of being perceived by the mind or senses | - |
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| (adjective) easily seen or detected | Synonyms: detectable |
| perceptibly | (adverb) in a noticeable manner | Synonyms: noticeably, observably |
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| perception | (noun) becoming aware of something via the senses | Synonyms: sensing |
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| (noun) the process of perceiving | - |
| (noun) the representation of what is perceived; basic component in the formation of a concept | Synonyms: percept, perceptual experience |
| (noun) a way of conceiving something | - |
| (noun) knowledge gained by perceiving | - |
| perceptive | (adjective) having the ability to perceive or understand; keen in discernment | - |
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| (adjective) of or relating to perception | - |
| perceptively | (adverb) in a perceptive manner | - |
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| perceptiveness | (noun) the quality of insight and sympathetic understanding | - |
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| (noun) delicate discrimination (especially of esthetic values) | Synonyms: appreciation, discernment, taste |
| (noun) perception of that which is obscure | Synonyms: discernment |
| (noun) a feeling of understanding | Synonyms: insight, perceptivity |
| perceptivity | (noun) a feeling of understanding | Synonyms: insight, perceptiveness |
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| perceptual | (adjective) of or relating to the act of perceiving | - |
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| perceptuality | (noun) The quality of being related to the organization, identification, and interpretation of sensory information. | - |
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| perceptually | (adverb) with regard to perception | - |
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| perch | (noun) spiny-finned freshwater food and game fishes | - |
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| (noun) any of numerous spiny-finned fishes of various families of the order Perciformes | - |
| (noun) support consisting of a branch or rod that serves as a resting place (especially for a bird) | - |
| (noun) any of numerous fishes of America and Europe | - |
| (noun) an elevated place serving as a seat | - |
| (noun) a linear measure of 16.5 feet | Synonyms: pole, rod |
| (noun) a square rod of land | Synonyms: pole, rod |
| (verb) sit, as on a branch | Synonyms: rest, roost |
| (verb) cause to perch or sit | - |
| (verb) to come to rest, settle | Synonyms: alight, light |
| perchance | (adverb) through chance | Synonyms: by chance |
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| (adverb) by chance | Synonyms: maybe, mayhap, peradventure, perhaps, possibly |
| percher | (noun) a bird with feet adapted for perching (as on tree branches); this order is now generally abandoned by taxonomists | Synonyms: Insessores, order Insessores, perching bird |
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| (noun) a person situated on a perch | - |
| perchlorate | (noun) a salt of perchloric acid | - |
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| perchloride | (noun) a chloride containing an unusually high proportion of chlorine | - |
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| perchloromethane | (noun) a colorless nonflammable liquid used as a solvent for fats and oils; because of its toxicity its use as a cleaning fluid or fire extinguisher has declined | Synonyms: carbon tet, carbon tetrachloride, tetrachloromethane |
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| percipient | (adjective) characterized by ease and quickness in perceiving | Synonyms: clear |
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| (noun) a person who becomes aware (of things or events) through the senses | Synonyms: beholder, observer, perceiver |
| percoid | (noun) any of numerous spiny-finned fishes of the order Perciformes | Synonyms: percoid fish, percoidean |
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| percoidean | (noun) any of numerous spiny-finned fishes of the order Perciformes | Synonyms: percoid, percoid fish |
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| percolate | (noun) the product of percolation | - |
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| (verb) gain or regain energy | Synonyms: gain vigor, perk, perk up, pick up |
| (verb) pass through | Synonyms: filter, permeate, sink in |
| (verb) cause (a solvent) to pass through a permeable substance in order to extract a soluble constituent | - |
| (verb) prepare in a percolator | - |
| (verb) permeate or penetrate gradually | Synonyms: leach |
| (verb) spread gradually | - |
| percolation | (noun) the act of making coffee in a percolator | - |
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| (noun) the filtration of a liquid for extraction or purification | - |
| (noun) the slow passage of a liquid through a filtering medium | Synonyms: infiltration |
| percolator | (noun) a coffeepot in which boiling water ascends through a central tube and filters back down through a basket of ground coffee beans | - |
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| percuss | (verb) strike or tap firmly | - |
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| percussion | (noun) the act of exploding a percussion cap | - |
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| (noun) the act of playing a percussion instrument | - |
| (noun) tapping a part of the body for diagnostic purposes | Synonyms: pleximetry |
| (noun) the section of a band or orchestra that plays percussion instruments | Synonyms: percussion section, rhythm section |
| percussionist | (noun) a musician who plays percussion instruments | - |
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| percussive | (adjective) involving percussion or featuring percussive instruments | - |
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| percussor | (noun) (medicine) a small hammer with a rubber head used in percussive examinations of the chest and in testing reflexes | Synonyms: plessor, plexor |
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| percutaneous | (adjective) through the unbroken skin; refers to medications applied directly to the skin (creams or ointments) or in time-release forms (skin patches) | Synonyms: transcutaneous, transdermal, transdermic |
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| repercuss | (verb) cause repercussions; have an unwanted effect | - |
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| repercussion | (noun) a movement back from an impact | Synonyms: backlash, rebound, recoil |
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| (noun) a remote or indirect consequence of some action | Synonyms: reverberation |
| supercargo | (noun) an officer on a merchant ship in charge of the cargo and its sale and purchase | - |
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| supercharge | (verb) increase the pressure on a gas or liquid | Synonyms: pressurise, pressurize |
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| (verb) increase or raise | Synonyms: advance, boost |
| supercharged | (adjective) fraught with great emotion | Synonyms: charged |
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| (adjective) (of e.g. an engine) having the power increased by fitting with a supercharger | - |
| supercharger | (noun) compressor that forces increased oxygen into the cylinders of an internal-combustion engine | - |
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| supercilious | (adjective) having or showing arrogant superiority to and disdain of those one views as unworthy | Synonyms: disdainful, haughty, imperious, lordly, overbearing, prideful, sniffy, swaggering |
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| (adjective) expressive of contempt | Synonyms: sneering, snide |
| superciliously | (adverb) with a sneer; in an uncomplimentary sneering manner | Synonyms: sneeringly, snidely |
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| superciliousness | (noun) the trait of displaying arrogance by patronizing those considered inferior | Synonyms: condescension, disdainfulness |
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| supercilium | (noun) the arch of hair above each eye | Synonyms: brow, eyebrow |
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| superclass | (noun) (biology) a taxonomic class below a phylum and above a class | - |
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| supercomputer | (noun) a mainframe computer that is one of the most powerful available at a given time | - |
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| superconductivity | (noun) the disappearance of electrical resistance at very low temperatures | - |
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| supercritical | (adjective) (especially of fissionable material) able to sustain a chain reaction in such a manner that the rate of reaction increases | - |
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| surfperch | (noun) small to medium-sized shallow-water fishes of the Pacific coast of North America | Synonyms: surf fish, surffish |
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| unperceivable | (adjective) impossible or difficult to perceive by the mind or senses | Synonyms: imperceptible |
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| unperceived | (adjective) not perceived or commented on | Synonyms: unremarked |
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| unperceiving | (adjective) lacking perception | Synonyms: unperceptive |
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| unperceptive | (adjective) lacking perception | Synonyms: unperceiving |
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| (adjective) lacking sensitivity, taste, or judgment | - |
| unperceptiveness | (noun) the lack of insight and sympathetic understanding | - |
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| uppercase | (adjective) relating to capital letters which were kept in the top half of a compositor's type case | - |
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| (noun) one of the large alphabetic characters used as the first letter in writing or printing proper names and sometimes for emphasis | Synonyms: capital, capital letter, majuscule, upper-case letter |
| uppercut | (noun) a swinging blow directed upward (especially at an opponent's chin) | - |
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