9 letters · 12 points in Scrabble
noun a light soil consisting of siliceous diatom remains and often used as a filtering material
originEtymology tree English diatom Proto-Indo-European *-tósder. Ancient Greek -της (-tēs)der. Ancient Greek -ῑ́της (-ī́tēs)der. Latin -ītēsbor. French -iteder. English -ite English diatomite From diatom + -ite.
Etymology from Wiktionary, CC BY-SA 3.0