| PORTRAITISTS | • portraitists n. Plural of portraitist. • PORTRAITIST n. a maker of portraits. |
| PROSTITUTORS | • prostitutors n. Plural of prostitutor. • PROSTITUTOR n. one who prostitutes. |
| ORTHOPTERISTS | • orthopterists n. Plural of orthopterist. • ORTHOPTERIST n. a student of insects. |
| TRAINSPOTTERS | • trainspotters n. Plural of trainspotter. • train␣spotters n. Plural of train spotter. • TRAINSPOTTER n. a train-watching enthusiast. |
| TROPOSCATTERS | • TROPOSCATTER n. the propagation of radio waves by using irregularities in the troposphere to scatter the signals beamed up by means of high-powered UHF transmitters and parabolic antennas. |
| STRATIGRAPHIST | • stratigraphist n. (Dated) A stratigrapher. • STRATIGRAPHIST n. a practitioner of stratigraphy, also STRATIGRAPHER. |
| TRICHOPTERISTS | • TRICHOPTERIST n. someone who studies the caddis flies. |
| COUNTERPROTESTS | • counterprotests n. Plural of counterprotest. • COUNTERPROTEST n. an opposing protest. |
| PHOTOTRANSISTOR | • phototransistor n. (Electronics) Any semiconductor device whose electrical characteristics are light-sensitive. • PHOTOTRANSISTOR n. a junction transistor, whose base signal is generated by illumination of the base. |
| STRATIGRAPHISTS | • stratigraphists n. Plural of stratigraphist. • STRATIGRAPHIST n. a practitioner of stratigraphy, also STRATIGRAPHER. |
| STREPTOTHRICINS | • streptothricins n. Plural of streptothricin. • STREPTOTHRICIN n. any of a group of related basic antibiotics produced by a streptomyces and active esp. against bacteria. |
| TRAINSPOTTERISH | • trainspotterish adj. (Informal) Like a trainspotter; obsessively nerdy. • TRAINSPOTTERISH adj. obsessed with trivial details, esp. of a subject generally considered uninteresting. |
| TRANSPORTATIONS | • transportations n. Plural of transportation. • TRANSPORTATION n. an act, process, or instance of transporting or being transported. |