| HEORTOLOGISTS | • heortologists n. Plural of heortologist. • HEORTOLOGIST n. one who practises heortology, the study of religious feasts. |
| HOMOEOPATHIST | • homoeopathist n. Alternative form of homeopathist. • homœopathist n. Obsolete form of homeopathist. • HOMOEOPATHIST n. one who practises homoeopathy, also HOMEOPATH, HOMEOPATHIST, HOMOEOPATH. |
| METHODOLOGIST | • methodologist n. A person who studies methodology, or applies its principles. • METHODOLOGIST n. a student of methodology. |
| ODONTORNITHES | • ODONTORNITHES n. fossil birds with teeth. |
| OPISTHOSOMATA | • opisthosomata n. Plural of opisthosoma. • OPISTHOSOMA n. the abdomen of a spider or other arachnid. |
| ORNITHOLOGIST | • ornithologist n. A person who studies or practices ornithology. • ORNITHOLOGIST n. one who studies birds. |
| ORTHODONTISTS | • orthodontists n. Plural of orthodontist. • ORTHODONTIST n. one who practises orthodontics. |
| ORTHOPTEROIDS | • orthopteroids n. Plural of orthopteroid. • ORTHOPTEROID n. a member of the Orthoptera, cockroaches. |
| ORTHOSTICHOUS | • orthostichous adj. (Botany) Having orthostichies. • ORTHOSTICHOUS adj. arranged in vertical rows. |
| ORTHOTROPISMS | • ORTHOTROPISM n. vertical growth. |
| PHOTOPOSITIVE | • photopositive adj. (Biology) having a positive phototropic or phototactic response; attracted by light. • PHOTOPOSITIVE adj. exhibiting positive phototropism or phototaxis. |
| PHOTOTROPISMS | • phototropisms n. Plural of phototropism. • PHOTOTROPISM n. movement directed by light. |
| PHOTOVOLTAICS | • photovoltaics n. (Physics) The technology of the conversion of sunlight into electricity using semiconductors that exhibit… • PHOTOVOLTAICS n. the science and technology of photovoltaic devices and substances. |
| PROSTHODONTIA | • PROSTHODONTIA n. the provision of false teeth, also PROSTHODONTICS. |
| PROTOHISTORIC | • protohistoric adj. Of or pertaining to protohistory. • PROTOHISTORIC adj. relating to protohistory. |
| PROTOTROPHIES | • prototrophies n. Plural of prototrophy. • PROTOTROPHY n. the state of being prototrophic. |
| SOMATOTROPHIC | • somatotrophic adj. That stimulates body growth, especially by producing somatotrophin. • SOMATOTROPHIC adj. promoting bodily growth, also SOMATOTROPIC. |
| SOMATOTROPHIN | • somatotrophin n. Alternative spelling of somatotropin. • SOMATOTROPHIN n. a polypeptide growth hormone, also SOMATOTROPIN, SOMATOTROPINE. |
| THORACOTOMIES | • thoracotomies n. Plural of thoracotomy. • THORACOTOMY n. surgical incision of the chest wall. |
| TROPHOTROPISM | • trophotropism n. The movements of the organs in a growing plant, as towards nutrient substances, induced by the chemical… • TROPHOTROPISM n. direction of growth by nutritional factors. |