| ANKYLOSAURUSES | • ankylosauruses n. Plural of ankylosaurus. • ANKYLOSAURUS n. a kind of dinosaur with a club tail, also ANKYLOSAUR. |
| HETEROSTYLISMS | • HETEROSTYLISM n. the state of having styles of different lengths in different flowers, also HETEROSTYLY. |
| HYPEROSTOSISES | • HYPEROSTOSIS n. abnormal growth of bone tissue. |
| HYSTEROSCOPIES | • hysteroscopies n. Plural of hysteroscopy. |
| IDIOSYNCRASIES | • idiosyncrasies n. Plural of idiosyncrasy. • IDIOSYNCRASY n. a peculiarity of constitution or temperament. |
| MYSTERIOUSNESS | • mysteriousness n. The quality of being mysterious. • MYSTERIOUSNESS n. the state of being mysterious. |
| NARCOSYNTHESES | • narcosyntheses n. Plural of narcosynthesis. • NARCOSYNTHESIS n. narcoanalysis directed toward unearthing repressed memories. |
| NARCOSYNTHESIS | • narcosynthesis n. A form of narcoanalysis in which the patient is made to recall repressed memories under hypnosis. • NARCOSYNTHESIS n. narcoanalysis directed toward unearthing repressed memories. |
| PERISSODACTYLS | • perissodactyls n. Plural of perissodactyl. • PERISSODACTYL n. an animal of the Perissodactyla, a division of ungulates with an odd number of toes, including the horse, tapir and rhinoceros, also PERISSODACTYLE. |
| PHOSPHOROLYSES | • phosphorolyses n. Plural of phosphorolysis. • PHOSPHOROLYSIS n. a reaction analogous to hydrolysis involving phosphoric acid. |
| PHOSPHORYLASES | • phosphorylases n. Plural of phosphorylase. • PHOSPHORYLASE n. any of the enzymes that catalyze phosphorolysis with the formation of organic phosphates. |
| PSYCHOMETRISTS | • psychometrists n. Plural of psychometrist. • PSYCHOMETRIST n. one who practises psychometry. |
| PSYCHONEUROSES | • psychoneuroses n. Plural of psychoneurosis. • PSYCHONEUROSIS n. neurosis. |
| PSYCHONEUROSIS | • psychoneurosis n. (Dated) neurosis. • PSYCHONEUROSIS n. neurosis. |
| PSYCHOSURGEONS | • psychosurgeons n. Plural of psychosurgeon. • PSYCHOSURGEON n. a practitioner of psychosurgery. |
| RESYNCHRONISES | • resynchronises v. Third-person singular simple present indicative form of resynchronise. • RESYNCHRONISE v. to synchronise again, also RESYNCHRONIZE. |
| SUPERLOBBYISTS | • superlobbyists n. Plural of superlobbyist. • SUPERLOBBYIST n. an exceptionally effective lobbyist. |
| SUPERLOYALISTS | • superloyalists n. Plural of superloyalist. • SUPERLOYALIST n. an extreme loyalist. |
| SYMPIESOMETERS | • sympiesometers n. Plural of sympiesometer. • SYMPIESOMETER n. instrument for measuring pressure of a current. |
| SYNCHROFLASHES | • SYNCHROFLASH n. a mechanism which synchronizes the opening of a camera shutter with the peak of brilliance of a flash bulb. |