| COPROSPERITIES | • COPROSPERITY n. shared prosperity. |
| DIPLEIDOSCOPES | • dipleidoscopes n. Plural of dipleidoscope. • DIPLEIDOSCOPE n. an instrument for ascertaining the moment of meridian passage by observing the coincidence of two images. |
| EPIPHYTOLOGIES | • EPIPHYTOLOGY n. the study of epiphytes. |
| OPPOSITENESSES | • oppositenesses n. Plural of oppositeness. • OPPOSITENESS n. the state of being opposite. |
| PERITONEOSCOPY | • PERITONEOSCOPY n. the visual examination of the peritoneal cavities by means of an endoscope inserted through an incision in the abdomen. |
| PHILOSOPHERESS | • philosopheress n. (Rare) A female philosopher. • PHILOSOPHERESS n. a female philosopher, also PHILOSOPHESS. |
| PHILOSOPHESSES | • philosophesses n. Plural of philosophess. • PHILOSOPHESS n. a female philosopher, also PHILOSOPHERESS. |
| PHOTOTHERAPIES | • phototherapies n. Plural of phototherapy. • PHOTOTHERAPY n. the treatment of disease by light. |
| POSTDEPRESSION | • postdepression adj. After an economic depression. • POSTDEPRESSION adj. after a depression. |
| PRECONCEPTIONS | • preconceptions n. Plural of preconception. • PRECONCEPTION n. a preconceived idea. |
| PREPOSSESSIONS | • prepossessions n. Plural of prepossession. • PREPOSSESSION n. a fixed conception likely to preclude objective judgment of anything seeming to be counter to it. |
| PROPERISPOMENA | • properispomena n. Plural of properispomenon. • PROPERISPOMENON n. a word with the circumflex accent on the penultimate syllable. |
| SPECTROSCOPIES | • spectroscopies n. Plural of spectroscopy. • SPECTROSCOPY n. the process or technique of using a spectroscope or spectrometer. |