vermiculite

[ ver-mik-yuh-lahyt ]

noun
  1. any of a group of platy minerals, hydrous silicates of aluminum, magnesium, and iron, that expand markedly on being heated: used in the expanded state for heat insulation and as a plant growth medium.

Origin of vermiculite

1
An Americanism dating back to 1815–25; vermicul(ar) + -ite1

Words Nearby vermiculite

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British Dictionary definitions for vermiculite

vermiculite

/ (vɜːˈmɪkjʊˌlaɪt) /


noun
  1. any of a group of micaceous minerals consisting mainly of hydrated silicate of magnesium, aluminium, and iron: on heating they expand and exfoliate and in this form are used in heat and sound insulation, fireproofing, and as a bedding medium for young plants

Origin of vermiculite

1
C19: from vermicul (ar) + -ite 1

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