| COSPONSORSHIP | • cosponsorship n. Joint sponsorship by more than one party. • COSPONSORSHIP n. the state of being a cosponsor.
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| DEIPNOSOPHIST | • deipnosophist n. A master of the art of dining, particularly learned conversation in the manner of Athenaeus’s characters. • DEIPNOSOPHIST n. a person skilled in dinner conversation.
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| DOORSTEPPINGS | • doorsteppings n. Plural of doorstepping. • DOORSTEPPING n. going from door to door canvassing.
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| NEPHROSCOPIES | • nephroscopies n. Plural of nephroscopy. • NEPHROSCOPY n. use of the nephroscope.
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| OPPOSITIONIST | • oppositionist n. A person who opposes; especially a member of an official opposition. • OPPOSITIONIST n. a member of an opposition.
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| PERISPOMENONS | • PERISPOMENON n. a word having a circumflex accent on the final syllable. | 
| PHOSPHOKINASE | • phosphokinase n. (Biochemistry) kinase. • PHOSPHOKINASE n. a kind of enzyme, aka kinase.
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| PHOSPHORISING | • phosphorising v. Present participle of phosphorise. • PHOSPHORISE v. to combine or impregnate with phosphorus, also PHOSPHORIZE.
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| POLYISOPRENES | • polyisoprenes n. Plural of polyisoprene. • POLYISOPRENE n. a rubberlike polymer of isoprene.
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| PORPHYROPSINS | • porphyropsins n. Plural of porphyropsin. • PORPHYROPSIN n. a purple pigment in the retinal rods of freshwater fishes that resembles rhodopsin.
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| POSTPOSITIONS | • postpositions n. Plural of postposition. • POSTPOSITION n. the placing of a grammatical element after a word to which it is primarily related in a sentence.
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| PRAXINOSCOPES | • praxinoscopes n. Plural of praxinoscope. • PRAXINOSCOPE n. an instrument with mirrors in which a series of moving drawings appear as a continuously moving picture; an early form of cinematograph.
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| PREPOSSESSION | • prepossession n. Preoccupation; having possession beforehand. • prepossession n. A preconceived opinion, or previous impression; bias, prejudice.
 • PREPOSSESSION n. a fixed conception likely to preclude objective judgment of anything seeming to be counter to it.
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| PROCONSULSHIP | • proconsulship n. The office or status of a proconsul; a proconsulate. • PROCONSULSHIP n. the office of proconsul.
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| PROSCRIPTIONS | • proscriptions n. Plural of proscription. • PROSCRIPTION n. the act of proscribing.
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| PROSOPAGNOSIA | • prosopagnosia n. (Neurology, pathology, psychology) A form of visual agnosia characterized by difficulty with face recognition… • PROSOPAGNOSIA n. inability to recognize familiar faces.
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| SIPHONOPHORES | • siphonophores n. Plural of siphonophore. • SIPHONOPHORE n. a marine creature, colonial in habit.
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| SUPERPOSITION | • superposition n. The placing of one thing on top of another. • superposition n. (Geology) The deposition of one stratum over another; the principle that in a series of sedimentary…
 • superposition n. (Quantum mechanics) The situation in quantum mechanics where two or more quantum states are added together…
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| SUPPOSITIONAL | • suppositional adj. Relating to, or based on, supposition; hypothetical; conjectural. • SUPPOSITIONAL adj. having the nature of a supposition.
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