| ISOSPIN | • isospin n. (Physics) A quantum number or symmetry related to the strong interaction. • ISOSPIN n. a quantum number applied to members of closely related groups of particles. |
| PASSION | • passion n. A true desire sustained or prolonged. • passion n. Any great, strong, powerful emotion, especially romantic love or extreme hate. • passion n. Fervor, determination. |
| PISTONS | • pistons n. Plural of piston. • PISTON n. a part of an engine. |
| POISONS | • poisons n. Plural of poison. • poisons v. Third-person singular simple present indicative form of poison. • POISON v. to administer a killing substance to. |
| POISSON | • Poisson n. (Mathematics) The Poisson distribution. • POISSON n. (French) a fish. |
| POSINGS | • posings n. Plural of posing. • POSING n. the act of posing. |
| POSSING | • possing v. Present participle of poss. • POSS v. to wash clothes with a stick by agitating. |
| POSTINS | • postins n. Plural of postin. • POSTIN n. (Persian) an Afghan sheepskin coat, also POSTEEN, POSHTEEN. |
| POUSSIN | • poussin n. A chicken reared to be eaten at a few weeks of age. • poussin n. A Cornish game hen. • POUSSIN n. (French) a chicken raised for eating at around six weeks old. |
| PRISONS | • prisons n. Plural of prison. • prisons v. Third-person singular simple present indicative form of prison. • PRISON v. to imprison. |
| SINOPIS | • sinopis n. The pigment sinopia. • SINOPIS n. (Latin) a reddish-brown pigment used for one of the preparatory drawings of a fresco, obtained from sinopite, an iron ore, also SINOPIA. |
| SIPHONS | • siphons n. Plural of siphon. • siphons v. Third-person singular simple present indicative form of siphon. • SIPHON v. (Greek) to draw off through a tube, also SYPHON. |
| SONSHIP | • sonship n. The position or state of being a son. • SONSHIP n. the state of being a son, also SONHOOD. |
| SPINORS | • spinors n. Plural of spinor. • SPINOR n. a type of mathematical vector. |
| SPINOSE | • spinose adj. Having spines. • SPINOSE adj. covered with thorns, also SPINOUS. |
| SPINOUS | • spinous adj. Having many spines. • spinous adj. Spine-like; spiny. • spinous adj. (Obsolete) Of a person: difficult to deal with, prickly. |
| SPINTOS | • spintos n. Plural of spinto. • SPINTO n. (Italian) a singing voice that is lyric and dramatic. |