| HEORTOLOGISTS | • heortologists n. Plural of heortologist. • HEORTOLOGIST n. one who practises heortology, the study of religious feasts. |
| IONTOPHORETIC | • iontophoretic adj. Of or pertaining to iontophoresis. • IONTOPHORETIC adj. relating to iontophoresis. |
| ODONTORNITHES | • ODONTORNITHES n. fossil birds with teeth. |
| ORTHOPTEROIDS | • orthopteroids n. Plural of orthopteroid. • ORTHOPTEROID n. a member of the Orthoptera, cockroaches. |
| PHOTODETECTOR | • photodetector n. Any device used to detect electromagnetic radiation. • PHOTODETECTOR n. any of various devices for detecting and measuring the intensity of radiant energy through photoelectric action. |
| PHOTOELECTRON | • photoelectron n. (Physics) An electron ejected from the surface of a material by the photoelectric effect. • PHOTOELECTRON n. an electron released from a surface by a photon. |
| PHOTONEUTRONS | • photoneutrons n. Plural of photoneutron. • PHOTONEUTRON n. a neutron emitted from a nucleus as a result of photodisintegration. |
| PHOTOREACTION | • photoreaction n. (Chemistry) a photochemical reaction. • PHOTOREACTION n. a photochemical reaction. |
| PHOTORECEPTOR | • photoreceptor n. (Biology) A specialized neuron or other structure able to detect and react to light. • PHOTORECEPTOR n. a receptor for light stimuli. |
| PROTOCHORDATE | • protochordate n. Any chordate of the phyla Hemichordata, Urochordata or Cephalochordata. • PROTOCHORDATE n. a member of the Protochordata. |
| PROTOTROPHIES | • prototrophies n. Plural of prototrophy. • PROTOTROPHY n. the state of being prototrophic. |
| THORACOTOMIES | • thoracotomies n. Plural of thoracotomy. • THORACOTOMY n. surgical incision of the chest wall. |
| TROUBLESHOOTS | • troubleshoots v. Third-person singular simple present indicative form of troubleshoot. • TROUBLESHOOT v. to solve problems. |