The dictionary definitions (supported by at least 8 dictionaries according to dictionary.com) I provided earlier are what I've heard these two adjectives to mean since the 1960s.
Supersonic: faster than the speed of sound. Ultrasonic: above the pitch of human hearing. I don't know any sensible reason to think that they mean anything else. "Ultrasonic" has never been used to mean "below the range of human hearing" ... that is the definition of the term "infrasonic". Of course, if y'all just want to be argumentative, go right ahead. G -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
