collimator
(noun) optical device consisting of a tube containing a convex achromatic lens at one end and a slit at the other with the slit at the focus of the lens; light rays leave the slit as a parallel beam
collimator
(noun) a small telescope attached to a large telescope to use in setting the line of the larger one
Source: WordNet® 3.1
collimator (plural collimators)
(physics) An optical device that generates a parallel beam of light. Often used to compensate for laser beam divergence.
(physics) A similar device that produces a parallel beam of particles such as neutrons.
(astronomy) A small telescope attached to a larger one, used to point it in the correct general direction.
• microatoll, mortal coil
Source: Wiktionary
Col"li*ma`tor, n.
1. (Astron.)
Definition: A telescope arranged and used to determine errors of collimation, both vertical and horizontal. Nichol.
2. (Optics)
Definition: A tube having a convex lens at one end and at the other a small opening or slit which is at the principal focus of the lens, used for producing a beam of parallel rays; also, a lens so used.
Source: Webster’s Unabridged Dictionary 1913 Edition
2 April 2025
(adjective) secret or hidden; not openly practiced or engaged in or shown or avowed; “covert actions by the CIA”; “covert funding for the rebels”
According to Guinness World Records, on 25 September 2016, the Birla Institute of Management Technology (India) in Uttar Pradesh, India, constructed the largest coffee cups pyramid consisting of 23,821 cups. They used paper takeaway coffee cups to build the pyramid.
