| OPISTHOTONIC | • opisthotonic adj. Relating to opisthotonus. • OPISTHOTONIC adj. of or like opisthotonos, extreme arching backwards of the spine and neck as a result of spasm of the muscles in that region. |
| OPISTHOTONOS | • opisthotonos n. (Medicine) Sustained tetanic spasm in which the body is bent backwards and stiffened, as produced by various diseases. • OPISTHOTONOS n. extreme arching backwards of the spine and neck as a result of spasm of the muscles in that region, etc. |
| ORTHOPTEROID | • orthopteroid n. (Entomology) Any of the insects historically included in the order Orthoptera, including the cockroaches… • ORTHOPTEROID n. a member of the Orthoptera, cockroaches. |
| ORTHOTROPIES | • ORTHOTROPY n. the state of being orthotropic, growing along a vertical axis. |
| ORTHOTROPISM | • orthotropism n. The property of being orthotropic or orthotropous. • ORTHOTROPISM n. vertical growth. |
| PHOTOTROPHIC | • phototrophic adj. (Biology) That exhibits phototrophy. • PHOTOTROPHIC adj. relating to phototropism, movement directed by light. |
| PHOTOTROPIES | • PHOTOTROPY n. change of colour due to wavelength of incident light. |
| PHOTOTROPISM | • phototropism n. (Biology) The movement of a plant towards or away from light. • PHOTOTROPISM n. movement directed by light. |
| PHOTOVOLTAIC | • photovoltaic adj. Producing a voltage when exposed to light. • photo-voltaic adj. Alternative spelling of photovoltaic. • PHOTOVOLTAIC adj. of, relating to, or utilizing the generation of a voltage when radiant energy falls on the boundary between dissimilar substances (as two different semiconductors). |
| PROTOHISTORY | • protohistory n. The period between prehistory and history, during which a culture or civilization has not yet developed… • PROTOHISTORY n. the study of human beings in the times that immediately antedate recorded history. |
| PROTOTROPHIC | • prototrophic adj. (Biology) Of or pertaining to a prototroph or to prototrophy. • PROTOTROPHIC adj. of bacteria, feeding directly on uncombined elements. |
| TROPHOBIOTIC | • trophobiotic adj. Of or pertaining to trophobiosis. • TROPHOBIOTIC adj. relating to trophobiosis, mutual exchange of nutriment in symbiosis. |
| TROPHOTROPIC | • trophotropic adj. Relating to trophotropy. • TROPHOTROPIC adj. related to trophotropism, direction of growth by nutritional factors. |
| TROPHOZOITES | • trophozoites n. Plural of trophozoite. • TROPHOZOITE n. in Protozoa, the trophic phase of an adult. |