| FOOTPLATEWOMEN | • FOOTPLATEWOMAN n. a female train driver and assistant. |
| ISOPROTERENOLS | • isoproterenols n. Plural of isoproterenol. • ISOPROTERENOL n. a sympathomimetic agent used in the treatment of asthma. |
| MONOTELEPHONES | • monotelephones n. Plural of monotelephone. • MONOTELEPHONE n. a telephone that transmits sounds of one pitch only. |
| OPTOELECTRONIC | • optoelectronic adj. Of or pertaining to optoelectronics. • optoelectronic adj. That has both optical and electronic components, especially such components that interact. • OPTOELECTRONIC adj. relating to optoelectronics. |
| PALAEOECOLOGIC | • palaeoecologic adj. Alternative form of paleoecologic. • PALAEOECOLOGIC adj. relating to palaeoecology. |
| PALAEOPEDOLOGY | • palaeopedology n. Alternative spelling of paleopedology. • palæopedology n. Obsolete spelling of paleopedology. • PALAEOPEDOLOGY n. the study of early soils. |
| PALEOBIOLOGIES | • PALEOBIOLOGY n. a branch of paleontology concerned with the biology of fossil organisms, also PALAEBIOLOGY, PALAEOBIOLOGY. |
| PALEOECOLOGIES | • paleoecologies n. Plural of paleoecology. • PALEOECOLOGY n. a branch of ecology that is concerned with the characteristics of ancient environments and with their relationships to ancient plants and animals. |
| PALEOECOLOGIST | • paleoecologist n. An ecologist whose speciality is paleoecology. • PALEOECOLOGIST n. one who studies paleoecology. |
| PALEONTOLOGIES | • PALEONTOLOGY n. the study of fossils, also PALAEONTOLOGY. |
| PALEOZOOLOGIES | • PALEOZOOLOGY n. the study of fossil animals, also PALAEOZOOLOGY. |
| PAROEMIOLOGIES | • PAROEMIOLOGY n. the study of proverbs. |
| PHOTOELECTRODE | • photoelectrode n. (Physics) Either electrode of a photoelectric cell. • PHOTOELECTRODE n. an electrode which can exhibit photoelectricity. |
| PHOTOELECTRONS | • photoelectrons n. Plural of photoelectron. • PHOTOELECTRON n. an electron released from a surface by a photon. |
| PHOTOGEOLOGIES | • PHOTOGEOLOGY n. a branch of geology concerned with the identification and study of geological features through the study of aerial or orbital photographs. |
| PNEUMONOLOGIES | • PNEUMONOLOGY n. the study of the respiratory system. |
| POLEMONIACEOUS | • polemoniaceous adj. Of or pertaining to the plant family Polemoniaceae. • POLEMONIACEOUS adj. belonging to the Polemoniaceae, the phlox family. |