vermiculite
(noun) any of a group of yellow or brown hydrous silicate minerals having a micaceous structure
Source: WordNet® 3.1
vermiculite (countable and uncountable, plural vermiculites)
(mineral) A hydrated silicate mineral which expands on heating; it is used in insulation and as a medium for planting.
Source: Wiktionary
Ver*mic"u*lite, n. Etym: [L. vermiculus, dim. of vermis worm.] (Min.)
Definition: A group of minerals having, a micaceous structure. They are hydrous silicates, derived generally from the alteration of some kind of mica. So called because the scales, when heated, open out into wormlike forms.
Source: Webster’s Unabridged Dictionary 1913 Edition
10 June 2025
(noun) the discipline that studies the principles of transmiting information and the methods by which it is delivered (as print or radio or television etc.); “communications is his major field of study”
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