| ARTHROSCOPY | • arthroscopy n. The examination of the interior of a joint (such as the knee) using an arthroscope. • ARTHROSCOPY n. the examination of joints with an arthroscope. |
| CHRYSOPRASE | • chrysoprase n. (Mineralogy) A variety of light-green translucent quartz. • CHRYSOPRASE n. a green variety of chalcedony used as a gem. |
| ERYTHROPSIA | • erythropsia n. An abnormality of vision causing objects to appear red. • ERYTHROPSIA n. a defect of vision in which objects appear red. |
| GRANOPHYRES | • granophyres n. Plural of granophyre. • GRANOPHYRE n. a kind of quartz-porphyry. |
| HETEROSPORY | • heterospory n. (Botany) The production of spores of two different sizes and sexes by the sporophytes of land plants. • HETEROSPORY n. the production of microspores and megaspores, as in seed plants. |
| HORSEPLAYER | • horseplayer n. (Gambling) A person who bets on horse races. • HORSEPLAYER n. one who habitually bets on horse races. |
| HYDROGRAPHS | • hydrographs n. Plural of hydrograph. • HYDROGRAPH n. a graph of variation of stream flow over time. |
| HYDROPOWERS | • HYDROPOWER n. water power. |
| HYDROSPHERE | • hydrosphere n. All the liquid waters of the Earth, as distinguished from the land and the gases of the atmosphere. • HYDROSPHERE n. the water of the earth. |
| HYGROGRAPHS | • hygrographs n. Plural of hygrograph. • HYGROGRAPH n. an instrument for recording variations in atmospheric humidity. |
| HYPERPOWERS | • hyperpowers n. Plural of hyperpower. • HYPERPOWER n. a state that is vastly stronger than any potential rival. |
| ORTHOPHYRES | • ORTHOPHYRE n. a fine-grained syenitic rock with orthoclase crystals. |
| PORPHYRITES | • porphyrites n. Plural of porphyrite. • PORPHYRITE n. a rock with a porphyritic structure; as, augite porphyrite. |
| PORPHYROIDS | • porphyroids n. Plural of porphyroid. • PORPHYROID n. a metamorphic rock having a texture characterized by large crystals set in a finer groundmass. |
| PYRETHROIDS | • pyrethroids n. Plural of pyrethroid. • PYRETHROID n. any of various synthetic compounds related to the pyrethrins, and sharing their insecticidal properties. |
| PYROPHOROUS | • pyrophorous adj. (Archaic) light-producing. • pyrophorous adj. (Archaic) of or relating to pyrophorus. • PYROPHOROUS adj. spontaneously igniting in air, also PYROPHORIC. |
| PYRRHOTINES | • pyrrhotines n. Plural of pyrrhotine. • PYRRHOTINE n. magnetic pyrites, an iron sulphide, often containing nickel, also PYRRHOTITE. |
| PYRRHOTITES | • pyrrhotites n. Plural of pyrrhotite. • PYRRHOTITE n. magnetic pyrites, an iron sulphide, often containing nickel, also PYRRHOTINE. |
| SEROTHERAPY | • serotherapy n. (Medicine) The therapeutic use of sera or vaccines. • SEROTHERAPY n. treatment with a serum or antitoxin. |
| SPIROGRAPHY | • spirography n. (Medicine) The measurement of breathing movements. • SPIROGRAPHY n. the recording of breathing movements. |