Aperture vs Cave - What's the difference?
aperture | cave | Related terms |
An opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall.
* Gilpin
* Owen
(optics) Something which restricts the diameter of the light path through one plane in an optical system.
(astronomy, photography) The diameter of the aperture (in the sense above) which restricts the width of the light path through the whole system. For a telescope, this is the diameter of the objective lens. e.g. a telescope may have a 100 cm aperture.
(spaceflight, communications) The (typically) large-diameter antenna used for receiving and transmitting radio frequency energy containing the data used in communication satellites, especially in the geostationary belt. For a comsat, this is typically a large reflective dish antenna; sometimes called an array .
(mathematics, rare, of a right circular cone) The maximum angle between the two generatrices.
A large, naturally-occurring cavity formed underground, or in the face of a cliff or a hillside.
* , chapter=16
, title= A hole, depression, or gap in earth or rock, whether natural or man-made.
* {{quote-book, 1918, Edward Alfred Steiner, Uncle Joe's Lincoln
, passage=Every boy at one time or another has dug a cave ; I suppose because ages and ages ago his ancestors had to live in caves,
A storage cellar, especially for wine or cheese.
A place of retreat, such as a man cave.
(caving) A naturally-occurring cavity in bedrock which is large enough to be entered by an adult.
(nuclear physics) A shielded area where nuclear experiments can be carried out.
* {{quote-book, 1986, National Council on Radiation Protection and Measurements, Radiation Alarms and Access Control Systems, page=45
, passage=These potential radiation fields or radioactive material levels may be the result of normal operations (ie, radiation in a target cave )
(drilling, uncountable) Debris, particularly broken rock, which falls into a drill hole and interferes with drilling.
* {{quote-book, 1951, James Deans Cumming, Diamond Drill Handbook, page=134
, passage=
(mining) A collapse or cave-in.
* {{quote-book, 1885, (Angelo Heilprin), Town Geology: The Lesson of the Philadelphia Rocks, page=79
, passage=The "breasts" of marble which unite the opposite lateral walls have been left standing in order to prevent a possible cave of the wall on either side.}}
The vagina.
* {{quote-book, 1976, (Chester Himes), My Life of Absurdity, page=59
, passage=Then without a word she lay on her back in the bed, her dark blond pubic hair rising about her dark wet cave like dried brush about a hidden spring.}}
A group that breaks from a larger political party or faction on a particular issue.
* {{quote-book, 1964, Leon D. Epstein, British Politics in the Suez Crisis, page=125
, passage=Without joining the cave , Hyde had abstained both in December 1956 and May 1957.}}
(obsolete) Any hollow place, or part; a cavity.
* Francis Bacon
To surrender.
To collapse.
To hollow out or undermine.
To engage in the recreational exploration of caves; to spelunk.
(mining) In room-and-pillar mining, to extract a deposit of rock by breaking down a pillar which had been holding it in place.
(mining, obsolete) To work over tailings to dress small pieces of marketable ore.
* {{quote-book, 1999, Andy Wood, The Politics of Social Conflict: The Peak Country, 1520-1770, page=319
, passage=As an indication of the miners' desperation in these years, the free miners of Wensley lowered themselves to caving for scraps of ore. }}
(obsolete) To dwell in a cave.
Aperture is a related term of cave.
As a noun aperture
is an opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall.As a proper noun cave is
.aperture
English
Noun
(en noun)- an aperture between the mountains
- the back aperture of the nostrils
- If the generatrix makes an angle ? to the axis, then the aperture is 2?.
Usage notes
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 100° aperture.Derived terms
* aperture priorityExternal links
* * ----cave
English
Etymology 1
(etyl), from (etyl) ).Noun
(en noun)The Mirror and the Lamp, passage=The preposterous altruism too!
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- the cave of the ear
Synonyms
*Derived terms
* caveman * cave painting * cavewomanVerb
(cav)- He caved under pressure.
- First the braces buckled, then the roof began to cave , then we ran.
- The levee has been severely caved by the river current.
- I have caved from Yugoslavia to Kentucky.
- Let's go caving this weekend.
- The deposit is caved by knocking out the posts.
citation
- (Shakespeare)