How many letters does the top answer for “having frequencies above those of audible sound” have?

The most common answer is ultrasonic (10 letters).

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Crossword clue: having frequencies above those of audible sound

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

ultrasonic 10 letters wn-def

having frequencies above those of audible sound

Pattern

having frequencies below those of audible sound 71% similar → infrasonic

Data: SCOWL, igerman98, RLA-ES, Grammalecte, br.ispell · frequency: OpenSubtitles (see Data & licenses)