| ARCHPRIESTHOODS | • archpriesthoods n. Plural of archpriesthood. • ARCHPRIESTHOOD n. the office of archpriest. |
| ASTROPHOTOGRAPH | • astrophotograph n. Alternative form of astrophoto. • ASTROPHOTOGRAPH n. a photograph of a celestial body. |
| BRACHISTOCHRONE | • brachistochrone n. (Mathematics) A cycloid; the curve of fastest descent between two points. • BRACHISTOCHRONE n. the curve along which a particle acted on by a force (e.g. gravity) will pass in the shortest time from one given point to another. |
| BRONCHOGRAPHIES | • BRONCHOGRAPHY n. radiological examination of the trachea or bronchi. |
| CATHODOGRAPHERS | • CATHODOGRAPHER n. one who takes photographs created using X-rays. |
| CHROMATOPHOROUS | • CHROMATOPHOROUS adj. of or like a chromatophore, a pigment-bearing cell. |
| CHROMATOSPHERES | • chromatospheres n. Plural of chromatosphere. • CHROMATOSPHERE n. a layer of incandescent gas surrounding the sun through which the light of the photosphere passes. |
| CHROMOTHERAPIES | • chromotherapies n. Plural of chromotherapy. • CHROMOTHERAPY n. colour therapy using red, green and violet as three primary colours. |
| CHRONOTHERAPIES | • chronotherapies n. Plural of chronotherapy. • CHRONOTHERAPY n. a treatment that work in harmony with the body's natural time rhythms. |
| HISTORIOGRAPHER | • historiographer n. A scholar who studies historiography. • HISTORIOGRAPHER n. one who practises historiography, the study of writing history. |
| HISTORIOGRAPHIC | • historiographic adj. Relating to the writing of history. • historiographic adj. Relating to the study and practice of historical scholarship. • HISTORIOGRAPHIC adj. relating to historiography. |
| HYPOMENORRHOEAS | • hypomenorrhoeas n. Plural of hypomenorrhoea. • HYPOMENORRHOEA n. the condition in which the interval between two menstrual periods is increased to between 35 and 42 days, also HYPOMENORRHEA. |
| ORCHESOGRAPHIES | • orchesographies n. Plural of orchesography. • ORCHESOGRAPHY n. notation of dancing. |
| ORTHOCHROMATISM | • orthochromatism n. Quality of being orthochromatic. • ORTHOCHROMATISM n. the state of being orthochromatic, of photographic film, sensitive to all colours except red. |
| ORTHOPSYCHIATRY | • orthopsychiatry n. (Psychiatry) branch of psychiatry concerned with the prevention of mental illness, especially in the young. • ORTHOPSYCHIATRY n. preventive psychiatry for young people. |
| POSTHEMORRHAGIC | • posthemorrhagic adj. Following hemorrhage. • POSTHEMORRHAGIC adj. taking place after a hemorrhage. |
| PYROPHOTOGRAPHS | • PYROPHOTOGRAPH n. a burnt-in photograph, e.g. on glass or porcelain. |
| RADIOPHOSPHORUS | • radiophosphorus n. Radioactive phosphorus (especially when used as a tracer). • RADIOPHOSPHORUS n. a radioactive isotope of phosphorus. |