perlite

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per·lite

also pearl·ite  (pûr′līt′)
n.
A natural volcanic glass similar to obsidian but having distinctive concentric cracks and a relatively high water content. In a fluffy heat-expanded form perlite is used as a lightweight aggregate, in fire-resistant insulation, and in soil for potted plants.

[French (from perle, pearl, from Old French; see pearl1) or German Perlit (from Perle, pearl, ultimately from Vulgar Latin *pernula).]

per·lit′ic (pər-lĭt′ĭk) adj.

perlite

(ˈpɜːlaɪt) or

pearlite

n
(Minerals) a variety of obsidian consisting of masses of small pearly globules: used as a filler, insulator, and soil conditioner
[C19: from French, from perle pearl1]
perlitic, pearlitic adj

per•lite

(ˈpɜr laɪt)

n.
a volcanic glass in which concentric fractures impart a distinctive structure resembling masses of small spheroids, used as a plant growth medium.
[1825–35; < French; see pearl1, -ite1]
per•lit′ic (-ˈlɪt ɪk) adj.
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References in periodicals archive ?
Paddy Mullins, best known for Dawn Run's historic victory at Cheltenham, always made the Galway Festival a high point of his year, winning the Galway Hurdle four times, with Negrada, Prince Tammy, Pearlstone and Camden Buzz and landing the Plate on three occasions, with Boro Quarter (1986), The Gooser (1992) and Nearly A Moose (2003).
Signatories included businessmen and philanthropists Charles Bronfman and Stanley Gold, the former head of the Israel lobby in Washington, Tom Dine, and former Jewish Agency board chairman Richard Pearlstone.
Theories regarding accessibility and applicability (Higgins, 1996; Tulving & Pearlstone, 1966) informed our use of this task, because, although priming effects are powerful behavioral elicitors, only those behaviors which are situationally applicable can be elicited in this manner.
32 (450m): Ellie Cupid, Drumena Yeats, Whitestar Honcho, Another For Joe (M), Melody's Choice (M), Pearlstone (W).
11: DH between NORTH TIREE (2), 3-1 and PEARLSTONE (6), 5-2 fav; 28.
See Zena Pearlstone, Katsina: Commodified and Appropriated Images of Hopi Supernaturals (Los Angeles: UCLA, Fowler Museum of Cultural History, 2001), 46-48.
Freedman is Peggy Meyerhoff Pearlstone Professor of Political Science Emeritus at Baltimore Hebrew University and a visiting professor of political science at the Johns Hopkins University.
FREEDMAN is Peggy Meyerhoff Pearlstone Professor of Political Science Emeritus at Baltimore Hebrew University and is currently Visiting Professor of Political Science at Johns Hopkins University where he teaches courses on the Arab-Israeli conflict and on Russian foreign policy.
Many years ago the Galway Hurdle was a good race for four-year-olds, with horses such as Paddy Bouler, Pearlstone and Pinch Hitter winning within a few years of each other.
Stilt walkers and balloon animals will fill the lobby of Centerstage July 30th through August 1st as The Party Animals bring their rock-n-roll show and pre-show carnival to Baltimore and the Pearlstone Theater.