noun, Physics, Optics.
a source of radiation sufficiently distant compared to its length and width that it can be considered as a point.
(optics) a source of light or other radiation that can be considered to have negligible dimensions
point source n.
A source, especially of pollution or radiation, occupying a very small area and having a concentrated output.
- Points system
noun 1. (Brit) a system used to assess applicants’ eligibility for local authority housing, based on (points awarded for) such factors as the length of time the applicant has lived in the area, how many children are in the family, etc
noun 1. a peak in W central Washington, to the S of Mount Rainier, in the Cascade Range.14,158 feet (4318 meters).
noun 1. Printing. a system for grading the sizes of type bodies, leads, etc., that employs the point as a unit of measurement. Compare (def 48a). 2. any of certain systems of writing and printing for the blind that employ embossed symbols for letters. 3. a system of promoting students by an evaluation of their […]
- Point-system test types
point-system test types pl.n. A near vision test chart containing test types that are multiples of a point ( 1/72 inch), lower-case letters being one-half the designated point size.