| BASSOONIST | • bassoonist n. A person who plays the bassoon, a musical instrument in the woodwind family. • BASSOONIST n. a performer on the bassoon. |
| HOUSTONIAS | • houstonias n. Plural of houstonia. • HOUSTONIA n. a small North American plant with blue, white or purple flowers. |
| ISODONTALS | • ISODONTAL n. an isodontal animal, also ISODONT. |
| ISOKONTANS | • ISOKONTAN n. any member of the Isokontae, the green algae, whose zoospores have equal cilia, also ISOKONT. |
| ISOLATIONS | • isolations n. Plural of isolation. • ISOLATION n. the state of being apart, isolated. |
| ISOOCTANES | • isooctanes n. Plural of isooctane. • iso-octanes n. Plural of iso-octane. • ISOOCTANE n. a fuel of the same octane rating. |
| ODONATISTS | • odonatists n. Plural of odonatist. • ODONATIST n. an expert on dragonflies. |
| ONOMASTICS | • onomastics n. The branch of lexicology devoted to the study of names and naming, especially the origins of names. • ONOMASTICS n. the study of proper names or of terms used in a specialized field. |
| OSTENSORIA | • ostensoria n. Plural of ostensorium. • OSTENSORIUM n. a monstrance (a receptacle for the Eucharist). |
| OUTPASSION | • outpassion v. (Transitive, rare) To be more passionate than; to surpass in passion. • OUTPASSION v. to exceed in passion. |
| SAINTHOODS | • sainthoods n. Plural of sainthood. • SAINTHOOD n. the state of being a saint. |
| SATINWOODS | • satinwoods n. Plural of satinwood. • SATINWOOD n. a smooth, satiny ornamental wood from India. |
| SOCIATIONS | • sociations n. Plural of sociation. • SOCIATION n. a plant community; the smallest area in which a full range of plants making up such a plant community may be found. |
| SOLVATIONS | • solvations n. Plural of solvation. • SOLVATION n. a chemical process in which a solute and solvent combine with relatively weak covalent bonds, e.g. hydration. |
| SONICATORS | • sonicators n. Plural of sonicator. • SONICATOR n. a device that sonicates. |
| SORTATIONS | • sortations n. Plural of sortation. • SORTATION n. sorting out. |
| SPOONBAITS | • spoonbaits n. Plural of spoonbait. • SPOONBAIT n. a lure on a swivel, used in trolling for fish, also SPOONHOOK. |
| TOPAGNOSIS | • TOPAGNOSIS n. a symptom of disease of or damage to the brain in which a person cannot identify a part of the body that has been touched, also TOPAGNOSIA. |
| VASOTOCINS | • vasotocins n. Plural of vasotocin. • VASOTOCIN n. a polypeptide pituitary hormone. |