unfilled aperture
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aperture — aperture, interstice, orifice denote an opening allowing passage through or in and out. Aperture is applied especially to any opening in a thing that otherwise presents a solid or closed surface or structure; it may be applied both to an opening… … New Dictionary of Synonyms
Navy Prototype Optical Interferometer — (NPOI) Layout The Navy Prototype Optical Interferometer (NPOI[1] note recently the Protoype was dropped so that the facility is now called NOI ), is an astronomical interferometer [2] operated by the United States Naval … Wikipedia
History of astronomical interferometry — See also: astronomical interferometerWilliam Herschel knew as early as 1779 (Herschel 1805) that stars appeared much larger in telescopes than they really were but he did not know why. When Thomas Young demonstrated interference and the wave… … Wikipedia
cavity — 1. A hollow space; hole. See cave, c., cavitas, cavernous space. 2. Lay term for the loss of tooth structure due to dental caries. SYN: cavum [TA], cavitas. [L. cavus … Medical dictionary
Military Affairs — ▪ 2009 Introduction Russia and Georgia fought a short, intense war in 2008, fueling global fears of a new Cold War. On August 7 Georgia launched an aerial bombardment and ground attacks against its breakaway province of South Ossetia.… … Universalium
hole — n Hole, hollow, cavity, pocket, void, vacuum are comparable when they mean an open or unfilled space in a thing. Hole may apply to an opening in a solid body that is or that suggests a depression or an excavation {those holes where eyes did once… … New Dictionary of Synonyms
opening — /oh peuh ning/, n. 1. an act or instance of making or becoming open. 2. the act of a person or thing that opens. 3. an unobstructed or unoccupied space or place. 4. a void in solid matter; a gap, hole, or aperture. 5. a tract of land thinly… … Universalium
hollow — Synonyms and related words: absurd, abysm, abyss, alveolation, alveolus, antrum, aperture, apparently sound, arid, armpit, artificial, bare, baritone, barren, basin, bass, blah, bland, blank, bleached, bloodless, boat shaped, boatlike, booth,… … Moby Thesaurus
open — I (New American Roget s College Thesaurus) adj. unclosed (see opening); unfilled, unengaged; free, public; unrestrained, unrestricted; frank, overt; spread out, unfolded, revealed. v. unfasten; unfold, spread out; reveal, disclose; start,… … English dictionary for students
opening — [ō′pə niŋ΄, ōp′niŋ΄] n. [ME openyng] 1. a becoming open or causing to be open 2. an open place or part; hole; gap; aperture ☆ 3. a clearing in the midst of a wooded area 4. a) a beginning; first part; commencement b) start … English World dictionary
