10 letters · 12 points in Scrabble
adjective having frequencies above those of audible sound
originEtymology tree Proto-Indo-European *h₂el- Latin ūls Proto-Indo-European *-teros? Latin -ter Old Latin -ād Latin -ā Latin ultrābor. English ultra- 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 English ultrasonic From ultra- + sonic.
Etymology from Wiktionary, CC BY-SA 3.0