Added 10 October 2026 silex /ˈsaɪlɛks/ noun Categories: NatureThingsRare Words Latin root: silex Wiktionary noun ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about silex at Wordnik → Where our words come from → A pure form of finely ground silica. A vacuum coffee maker. Origin Borrowed from Latin silex. From Wiktionary, via Kaikki.org (CC BY-SA) Related Words: silexiteflintstonepetrosilexfirestonesycitefelstoneflintwareflintsilicum Back to today's word