| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
photoelectric pho·to·e·lec·tric (fō'tō-ĭ-lěk'trĭk) or pho·to·e·lec·tri·cal (-trĭ-kəl)
adj.
Of or relating to the electric effects, especially increased conductivity, caused by light.
| photoelectric (fō'tō-ĭ-lěk'trĭk) Pronunciation Key
Relating to or exhibiting to electrical effects upon exposure to light. For example, some photoelectric materials emit electrons called photoelectrons upon exposure to certain frequencies of light; others, such as photoresistors and phototransistors, change their electrical properties. See also photoelectric effect. |