a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return; "sonar is an acronym for sound navigation ranging"; "asdic is an acronym for antisubmarine detection investigation committee"
extensive tract of level open land; "they emerged from the woods onto a vast open plain"; "he longed for the fields of his youth"
lacking embellishment or ornamentation; "a plain hair style"; "unembellished white walls"; "functional architecture featuring stark unornamented concrete"
free from any effort to soften to disguise; "the plain and unvarnished truth"; "the unvarnished candor of old people and children"
lacking patterns especially in color
not elaborate or elaborated; simple; "plain food"; "stuck to the plain facts"; "a plain blue suit"; "a plain rectangular brick building"
not mixed with extraneous elements; "plain water"; "sheer wine"; "not an unmixed blessing"
the flash of light that accompanies an electric discharge in the atmosphere (or something resembling such a flash); can scintillate for a second or more
abrupt electric discharge from cloud to cloud or from cloud to earth accompanied by the emission of light
consisting of two (units or components or elements or terms) or based on two; "a binary star is a system in which two stars revolve around each other"; "a binary compound"; "the binary number system has two as its base"
of or pertaining to a number system have 2 as its base; "a binary digit"
a surface of hardened plaster (as on a wall or ceiling); "there were cracks in the plaster"
a mixture of lime or gypsum with sand and water; hardens into a smooth solid; used to cover walls and ceilings
coat with plaster; "daub the wall"
apply a heavy coat to
apply a plaster cast to; "plaster the broken arm"
affix conspicuously; "She plastered warnings all over the wall"
cover conspicuously or thickly, as by pasting something on; "The demonstrators plastered the hallways with posters"; "She let the walls of the apartment be beplastered with stucco"