| DEHYDRORETINOLS | • DEHYDRORETINOL n. vitamin A2. | 
| ECTOMYCORRHIZAS | • ectomycorrhizas n. Plural of ectomycorrhiza. • ECTOMYCORRHIZA n. a type of mycorrhiza in which the fungus forms a layer on the outside of the roots of the plant.
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| ERYTHROPOIETINS | • erythropoietins n. Plural of erythropoietin. • ERYTHROPOIETIN n. a glycoprotein hormone that stimulates the production of red blood cells by stem cells in bone marrow.
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| HEXYLRESORCINOL | • hexylresorcinol n. (Organic chemistry) A hexyl derivative of resorcinol that has anaesthetic, antiseptic and antihelmintic properties. • HEXYLRESORCINOL n. a crystalline phenol used as an antiseptic and anthelmintic.
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| HYDROCORALLINES | • HYDROCORALLINE n. a member the Hydrozoa, which includes millepores etc. | 
| HYDROCORTISONES | • hydrocortisones n. Plural of hydrocortisone. • HYDROCORTISONE n. a glucocorticoid hormone that is used to treat inflammatory and allergic conditions, aka cortisol.
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| HYDROXYPROLINES | • hydroxyprolines n. Plural of hydroxyproline. • HYDROXYPROLINE n. an amino acid.
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| HYSTRICOMORPHIC | • HYSTRICOMORPHIC adj. belonging to the rodent suborder Hystricomorpha, which includes porcupines, cavies, agoutis, and chinchillas. | 
| MICROSPOROPHYLL | • microsporophyll n. A leaflike organ that bears one or more microsporangia (contrast megasporophyll or macrosporophyll). • MICROSPOROPHYLL n. a specialised leaf bearing or subtending one or more microsporangia.
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| MYOCARDIOGRAPHS | • MYOCARDIOGRAPH n. an instrument for recording the movements of heart muscle. | 
| 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.
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| 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.
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| PORPHYROGENITES | • porphyrogenites n. Plural of porphyrogenite. • PORPHYROGENITE n. a Byzantine emperor's son, born in the purple.
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| PROTOPORPHYRINS | • protoporphyrins n. Plural of protoporphyrin. • PROTOPORPHYRIN n. metal-free porphyrin derived from blood hemin.
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| RHOMBPORPHYRIES | • RHOMBPORPHYRY n. an intermediate, moderately fine-grained igneous rock with feldspar inclusions, also RHOMBENPORPHYR, RHOMBENPORPHYRY. | 
| SEMIPORNOGRAPHY | • semipornography n. Material that is partly or somewhat pornographic. • SEMIPORNOGRAPHY n. material approaching the pornographic.
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