Rockwool

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    Inorganic material resembling fiber, used primarily for insulation and soundproofing. countable, uncountable
  2. 2
    A horticultural growing medium made from natural ingredients, usually including basalt rock and chalk. countable, uncountable

    "In 1985, rockwool was introduced to the United States as an alternative to conventional soil and other soilless mediums. Rockwool is made of thin fibers of volcanic rock or a combination of volcanic rock, limestone, and coke."

Synonyms

All synonyms
mineral wool

Example

More examples

"In 1985, rockwool was introduced to the United States as an alternative to conventional soil and other soilless mediums. Rockwool is made of thin fibers of volcanic rock or a combination of volcanic rock, limestone, and coke."

Etymology

From rock + wool.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.