APERTURES
Noun
apertures
plural of aperture
Anagrams
• repasture
Source: Wiktionary
APERTURE
Ap"er*ture, n. Etym: [L. apertura, fr. aperire. See Aperient.]
1. The act of opening. [Obs.]
2. An opening; an open space; a gap, cleft, or chasm; a passage
perforated; a hole; as, an aperture in a wall.
An aperture between the mountains. Gilpin.
The back aperture of the nostrils. Owen.
3. (Opt.)
Definition: The diameter of the exposed part of the object glass of a
telescope or other optical instrument; as, a telescope of four-inch
aperture.
Note: The aperture of microscopes is often expressed in degrees,
called also the angular aperture, which signifies the angular breadth
of the pencil of light which the instrument transmits from the object
or point viewed; as, a microscope of 100Âş aperture.
Source: Webster’s Unabridged Dictionary 1913 Edition