| HOLOHEDRON | • holohedron n. A holohedral crystal. • HOLOHEDRON n. a geometrical form possessing the property of holohedrism. |
| HOMEOMORPH | • homeomorph n. (Chemistry) Material that exhibits similarity in crystalline structure. • homeomorph n. Anything characteristic of homeomorphism. • HOMEOMORPH n. a thing similar in form from another but essentially different, also HOMOEOMORPH. |
| 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. |
| HOMOMORPHS | • homomorphs n. Plural of homomorph. • HOMOMORPH n. a thing having the same form as another. |
| 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. |
| LOPHOPHORE | • lophophore n. (Zoology) A feeding organ of brachiopods, bryozoans and phoronids. • LOPHOPHORE n. a ring of ciliated tentacles round the mouth of some sedentary marine animals. |
| MOTHERHOOD | • motherhood n. The state of being a mother. • motherhood n. Mothers, considered as a group. • MOTHERHOOD n. the state of being a mother. |
| OPHIOMORPH | • OPHIOMORPH n. a caecilian amphibian. |
| ORPHANHOOD | • orphanhood n. The state of being an orphan; the losing of both parents through their death. • ORPHANHOOD n. the state of being an orphan, also ORPHANISM. |
| PHONOPHORE | • phonophore n. The phonetic component of a character in Chinese and related writing systems. • phonophore n. A type of telegraph. • PHONOPHORE n. a sound-conducting apparatus, of various kinds; a device for telephoning and telegraphing simultaneously by the same wire. |
| PHOTOPHORE | • photophore n. (Biology) A light-emitting organ, found in some fish and other marine animals. • photophore n. (Medicine) A form of endoscope using an electric light. • PHOTOPHORE n. a luminiferous organ. |
| PHOTOTROPH | • phototroph n. A photoautotroph. • PHOTOTROPH n. a plant which uses light to generate energy needed to absorb nutrients. |