| GENETOTROPHIC | • GENETOTROPHIC adj. denoting a defect in metabolism which prevents the normal assimilation of essential food elements. |
| HEORTOLOGISTS | • heortologists n. Plural of heortologist. • HEORTOLOGIST n. one who practises heortology, the study of religious feasts. |
| HERPETOLOGIST | • herpetologist n. One who studies reptiles and amphibians; a reptile and amphibian specialist. • HERPETOLOGIST n. one who studies snakes. |
| ORNITHOLOGIST | • ornithologist n. A person who studies or practices ornithology. • ORNITHOLOGIST n. one who studies birds. |
| ORTHOGNATHIES | • ORTHOGNATHY n. the state of having normally aligned jaws. |
| ORTHOGNATHISM | • orthognathism n. (Anatomy) The quality of being orthognathous. • ORTHOGNATHISM n. the state of having straight jaws. |
| ORTHOGONALITY | • orthogonality n. (Mathematics, statistics, software engineering) The property of being orthogonal. • ORTHOGONALITY n. the state of being orthogonal. |
| ORTHOGRAPHIST | • orthographist n. One who is versed in orthography. • ORTHOGRAPHIST n. an orthographer. |
| ORTHOTUNGSTIC | • ORTHOTUNGSTIC adj. as in orthotungstic acid. |
| PHOTOGRAPHIST | • photographist n. (Dated) One who produces photographs. • PHOTOGRAPHIST n. a photographer. |
| THIGMOTROPISM | • thigmotropism n. (Biology) Growth or motion in response to touch. • THIGMOTROPISM n. the response of an organism to direct contact with a surface, e.g. a creeping plant that twines itself around a support. |
| TOOTHBRUSHING | • toothbrushing v. Present participle of toothbrush. • toothbrushing n. An act of brushing the teeth. • TOOTHBRUSHING n. the action of using a toothbrush to clean teeth. |
| TRAPSHOOTINGS | • TRAPSHOOTING n. the sport of shooting from traps. |
| TRICHOLOGISTS | • trichologists n. Plural of trichologist. • TRICHOLOGIST n. a person who specializes in hair and scalp care. |