perlite

per·lite

noun \ˈpər-ˌlīt\

Definition of PERLITE

: volcanic glass that has a concentric structure, appears as if composed of concretions, is usually grayish and sometimes spherulitic, and when heated expands to form a lightweight aggregate used especially in concrete and plaster and as a medium for potting plants

— per·lit·ic \ˌpər-ˈli-tik\ adjective

Origin of PERLITE

French, from perle pearl

First Known Use: 1833

Rhymes with PERLITE

affright, air right, airtight, albite, Albright, alight, all right, all-night, a mite, aright, backbite, backlight, bauxite, bedight, birthright, black light, bleed white, bobwhite, bombsight, box kite, calcite, campsite, catfight, cockfight, contrite, cordite, Cushite, daylight, deadlight, delight, dendrite, despite, dogfight, downlight, downright, droplight, dust mite, earthlight, excite, eyebright, eyesight, fanlight, felsite, ferrite, finite, fire blight, firefight, firelight, first night, fistfight, flashlight, fleabite, floodlight, foresight, forthright, fortnight, freewrite, frostbite, Gadite, gall mite, gaslight, gastight, ghostwrite, goethite, graphite, green light, gummite, gunfight, half-light, halite, Hamite, handwrite, headlight, highlight, hindsight, Hittite, homesite, hoplite, Hussite, ignite, illite, infight, in-flight, incite, indict, indite, insight, in sight, invite, jacklight, jadeite, key light, lamplight, late blight, leucite, Levite, lighttight, lignite, limelight, lintwhite, lowlight, Lucite, Luddite, lyddite, marmite, Melchite, Memphite, midnight, millwright, moonlight, New Right, night-light, nitrite, off-site, off-white, on sight, on-site, outright, outsight, partite, peep sight, penlight, playwright, polite, preflight, prizefight, pyrite, quartzite, ratite, recite, red light, red-light, requite, respite, rewrite, rushlight, rust mite, safelight, samite, searchlight, Semite, Servite, Shemite, Shiite, shipwright, sidelight, sit tight, skintight, skylight, skywrite, slant height, smectite, snakebite, snow-white, sound bite, spaceflight, spotlight, stage fright, starlight, sternite, sticktight, stoplight, streetlight, stylite, sulfite, sunlight, Sunnite, taillight, termite, thermite, tonight, torchlight, trothplight, Twelfth Night, twilight, twi-night, typewrite, unite, unsight, upright, uptight, wainwright, watch night, wax light, Web site, weeknight, wheelwright, white flight, white knight, x-height, zinc white

perlite

noun    (Concise Encyclopedia)

Natural glass with concentric cracks such that the rock breaks into small, pearl-like bodies. It is formed by the rapid cooling of viscous lava or magma. Perlite is porous and has a waxy to pearly lustre and is commonly gray or greenish but may be brown, blue, or red. Since c. 1950, large deposits have been worked in New Mexico, Nevada, California, and other western states. Heat-treated perlite is a substitute for sand in lightweight wall plaster and concrete aggregate. Perlite is used for heat and sound insulation, lightweight ceramic products, and filters.

Variants of PERLITE

perlite or pearlstone