| CHLOROPHYLS | • CHLOROPHYL n. the green colouring in plants concerned with the production of sugars, also CHLOROPHYLL. |
| CHOMOPHYTES | • chomophytes n. Plural of chomophyte. • CHOMOPHYTE n. a plant growing on rocky ledges. |
| HOBBYHORSED | • HOBBYHORSE v. of a vessel, to pitch violently. |
| HOBBYHORSES | • hobbyhorses n. Plural of hobbyhorse. • hobby-horses n. Plural of hobby-horse. • hobby␣horses n. Plural of hobby horse. |
| HOLOPHYTISM | • holophytism n. (Biology) The property of being a holophyte. • HOLOPHYTISM n. the property of being holophytic, obtaining food by photosynthesis. |
| HOMOPHYLIES | • homophylies n. Plural of homophyly. • HOMOPHYLY n. resemblance due to common ancestry. |
| HONEYMONTHS | • honey-months n. Plural of honey-month. • HONEYMONTH v. (obsolete) to spend one's honeymoon, also HONEYMOON. |
| HOYDENHOODS | • HOYDENHOOD n. the state of being a hoyden. |
| HYDROCHORES | • hydrochores n. Plural of hydrochore. • HYDROCHORE n. a plant disseminated by water. |
| HYDROPHONES | • hydrophones n. Plural of hydrophone. • HYDROPHONE n. an apparatus for listening to sounds conveyed by water. |
| HYGROPHOBES | • HYGROPHOBE n. a plant growing best where moisture is scanty. |
| HYLOPHAGOUS | • hylophagous adj. That feeds on wood. • HYLOPHAGOUS adj. eating wood. |
| HYPOSTROPHE | • hypostrophe n. (Medicine) The act of a patient turning himself or herself. • hypostrophe n. (Medicine) A relapse, or return of a disease. • hypostrophe n. (Rhetoric) The use of insertion or parenthesis. |
| HYPSOCHROME | • hypsochrome adj. Hypsochromic. • HYPSOCHROME n. a shift to a shorter wavelength in the absorption spectrum of a compound. |
| HYPSOPHOBES | • HYPSOPHOBE n. a person suffering from hypsophobia, a fear of falling from high places. |
| HYPSOPHOBIA | • hypsophobia n. Fear of heights. • HYPSOPHOBIA n. a fear of falling from high places. |
| ORTHOPHYRES | • ORTHOPHYRE n. a fine-grained syenitic rock with orthoclase crystals. |
| ORTHOSTICHY | • orthostichy n. (Botany) A row of leaves along a stem. • ORTHOSTICHY n. a straight row, e.g. of leaves vertically over one another on an axis. |
| PHOSPHORYLS | • phosphoryls n. Plural of phosphoryl. • PHOSPHORYL n. the radical PO, regarded as the typical nucleus of certain compounds. |
| PHOTOGLYPHS | • PHOTOGLYPH n. photographic engraving. |