| CHROMOXYLOGRAPH | • chromoxylograph n. A woodcut produced in colour. • CHROMOXYLOGRAPH n. a picture printed in colours from wooden blocks. |
| EPICHLOROHYDRIN | • epichlorohydrin n. (Chemistry) Any epihalohydrin in which the halogen is chlorine. • EPICHLOROHYDRIN n. a volatile liquid toxic epoxide used esp. in making epoxy resins and rubbers. |
| HEMATOPORPHYRIN | • hematoporphyrin n. (Biochemistry) The porphyrin portion of heme (minus the iron atom). • HEMATOPORPHYRIN n. any of several porphyrins that are hydrated derivatives of protoporphyrins. |
| HYDROSULPHUROUS | • HYDROSULPHUROUS adj. as in hydrosulphurous acid. |
| HYETOMETROGRAPH | • HYETOMETROGRAPH n. an instrument for recording rainfall. |
| 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. |
| HYSTRICOMORPHIC | • HYSTRICOMORPHIC adj. belonging to the rodent suborder Hystricomorpha, which includes porcupines, cavies, agoutis, and chinchillas. |
| ORNITHORHYNCHUS | • ornithorhynchus n. A platypus (genus Ornithorhynchus). • Ornithorhynchus prop.n. A taxonomic genus within the family Ornithorhynchidae – the single species Ornithorhynchus anatinus… • ORNITHORHYNCHUS n. the duckbill platypus. |
| 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. |
| PHYTOGEOGRAPHER | • phytogeographer n. A person involved in phytogeography. • PHYTOGEOGRAPHER n. a student of phytogeography. |
| PYROPHOTOGRAPHS | • PYROPHOTOGRAPH n. a burnt-in photograph, e.g. on glass or porcelain. |
| PYROPHOTOGRAPHY | • pyrophotography n. (Photography) Any photographic process involving the use of heat to fix the picture. • PYROPHOTOGRAPHY n. the production of pyrophotographs. |
| RHOMBENPORPHYRS | • RHOMBENPORPHYR n. an intermediate, moderately fine-grained igneous rock with feldspar phenocrysts rhombic in section, also RHOMBENPORPHYRY, RHOMBPORPHYRY. |
| RHOMBENPORPHYRY | • RHOMBENPORPHYRY n. an intermediate, moderately fine-grained igneous rock with feldspar inclusions, also RHOMBENPORPHYR, RHOMBPORPHYRY. |
| RHOMBPORPHYRIES | • RHOMBPORPHYRY n. an intermediate, moderately fine-grained igneous rock with feldspar inclusions, also RHOMBENPORPHYR, RHOMBENPORPHYRY. |