Appox. usage (any sense): 0.252 per million words
ultrasonor Adjective, ultrasonor
Appox. usage (any sense): less than 0.1 per million words
Appox. usage (any sense): less than 0.1 per million words
ultraacustic Noun, ultraacustic
Appox. usage (any sense): less than 0.1 per million words
Appox. usage (any sense): less than 0.1 per million words