the dark space between the cathode glow and the negative glow in a vacuum tube, occurring when the pressure is low.
[kroo k-sahyt] /ˈkrʊk saɪt/ noun 1. a rare mineral, selenide of copper, thallium, and silver, (Cu, Tl, Ag) 2 Se, occurring in steel-gray, compact masses.
- Crookes lens
noun 1. a type of lens, used in sunglasses, that is made from glass containing cerium. It reduces the transmission of ultraviolet radiation
noun, Optics. 1. (def 1). noun 1. (physics) a type of radiometer consisting of an evacuated glass bulb containing a set of lightweight vanes, each blackened on one side. The vanes are mounted on a vertical axis and revolve when light, or other radiant energy, falls on them
[kroo k] /krʊk/ adjective, Australian. 1. sick or feeble. 2. ill-humored; angry. 3. out of order; functioning improperly. 4. unsatisfactory; disappointing. /krʊk/ noun 1. a curved or hooked thing 2. a staff with a hooked end, such as a bishop’s crosier or shepherd’s staff 3. a turn or curve; bend 4. (informal) a dishonest person, […]