Related Words

Hot Corner: Third base.

Photorespiration: Enhanced respiration of plants in the light relative to dark respiration

Photoperiodism: The ability of certain plants to sense the relative amounts of light and dark in a 24-hour period; controls the onset of fiowering in many plants.

Photosphere: The intensely bright portion of the sun visible to the unaided eye; the 'surface' of the sun. Reaching temperatures estimated at about 11,000°F, it is the portion of the sun's atmosphere wh . . . View Full Definition

Photosynthate: A substance synthesized in the process of photosynthesis

Photon: A discrete packet of energy associated with electromagnetic radiation. Each photon carries energy E proportional to the frequency nu of the radiation: E = hnu, where h is Planck's constant.

Photometer: Any of a number of atmospheric phenomena which appear as luminous patterns in the sky. They do not directly cause adverse weather. They include halos, coronas. rainbows, and fogbows.

Photolamp: Tungsten filament photographic lamp with a large diffused bulb, giving light of 3200 k (kelvin).

Photolinen: Laminate of linen and paper coated with black and white photographic emulsion. It is used for photographic wall coverings.

Photolithography: Lithographic printing process using an image formed by photographic means.