| CHLOROPHYL | • chlorophyl n. Dated form of chlorophyll. • CHLOROPHYL n. the green colouring in plants concerned with the production of sugars, also CHLOROPHYLL. |
| HOBBYHORSE | • hobbyhorse n. Alternative spelling of hobby horse. • hobby-horse n. Alternative spelling of hobby horse. • hobby␣horse n. (Originally) The Irish hobby, an extinct breed of horse. |
| HOLOGRAPHY | • holography n. (Physics) a technique for recording, and then reconstructing, the amplitude and phase distributions… • HOLOGRAPHY n. the technique or process of making or using holograms. |
| HOMOCHROMY | • homochromy n. (Zoology) The use, by an organism, of the same colour as its background as a means of protection. • HOMOCHROMY n. protective coloration. |
| HOMOGRAPHY | • homography n. The state or quality of being written in the same way, especially when spelled with the same letters… • homography n. (Geometry) An isomorphism between projective spaces that maps straight lines to straight lines. • HOMOGRAPHY n. a type of transformation that maps straight lines onto another plane. |
| HOMOMORPHY | • homomorphy n. (Biology) similarity of form; resemblance in external character or in geometric ground form. • HOMOMORPHY n. similarity in form, as of the flowers of a plant, also HOMEOMORPHY. |
| HOMOTHERMY | • HOMOTHERMY n. the maintenance of a constant body temperature, also HOMEOTHERMISM, HOMEOTHERMY, HOMOIOTHERMY. |
| HOROGRAPHY | • horography n. (Historical) local history (in Ancient Greece) that involved the description of events. • horography n. The art of constructing dials or instruments for indicating the hours. • HOROGRAPHY n. the art of constructing sundials or clocks. |
| HYDROCHORE | • hydrochore n. A plant whose spores, seeds, or fruits are dispersed by water. • HYDROCHORE n. a plant disseminated by water. |
| HYDROPHONE | • hydrophone n. A transducer that converts underwater sound waves into electrical signals, rather like a microphone. • HYDROPHONE n. an apparatus for listening to sounds conveyed by water. |
| HYGROPHOBE | • HYGROPHOBE n. a plant growing best where moisture is scanty. |
| HYPOMORPHS | • hypomorphs n. Plural of hypomorph. • HYPOMORPH n. a mutant gene but having a similar but weaker effect than the corresponding wild-type gene. |
| ORTHOPHYRE | • orthophyre n. (Geology) a porphyritic rock that contains phenocrysts of orthoclase embedded in feldspar. • ORTHOPHYRE n. a fine-grained syenitic rock with orthoclase crystals. |
| PHOSPHORYL | • phosphoryl n. (Chemistry) the trivalent radical O=P≡. • PHOSPHORYL n. the radical PO, regarded as the typical nucleus of certain compounds. |
| THOROUGHLY | • thoroughly adv. In a thorough or complete manner. • THOROUGH adv. complete, also THORO. |