5 letters · 7 points in Scrabble
adjective (of speed) having or caused by speed approximately equal to that of sound in air at sea level
adjective relating to audible sound
originEtymology tree Proto-Indo-European *swenh₂- Proto-Indo-European *swónh₂os Latin sonus Proto-Indo-European *-ikos Proto-Italic *-ikos Latin -icuslbor. Old French -iquebor. Middle English -ik English -ic English sonic From Latin sonus + English -ic.
Etymology from Wiktionary, CC BY-SA 3.0