infrasound

As a noun infrasound

is (physics) sound waves having frequency below the human audible range (below about 20 hz).

As an adjective radiofrequency is

.

As a noun infrasound

is (physics) sound waves having frequency below the human audible range (below about 20 hz).

As an adjective undefined is

lacking a definition or value.

As nouns the difference between infrasound and microwave

is that infrasound is sound waves having frequency below the human audible range (below about 20 Hz) while microwave is an electromagnetic wave with wavelength between that of infrared light and radio waves.

As a verb microwave is

to cook (something) in a microwave oven.

As nouns the difference between infrasound and ultrasounds

is that infrasound is sound waves having frequency below the human audible range (below about 20 Hz) while ultrasounds is plural of ultrasound.

As nouns the difference between infrared and infrasound

is that infrared is electromagnetic radiation of a wavelength longer than visible light, but shorter than microwave radiation, having a wavelength between 700 nm and 1 mm while infrasound is sound waves having frequency below the human audible range (below about 20 Hz).

As an adjective infrared

is having the wavelength in the infrared.

As a noun infrasound

is (physics) sound waves having frequency below the human audible range (below about 20 hz).

As an adjective hypersonic is

(of a speed|aviation) equal to, or greater than, or capable of achieving, five times the speed of sound.

As a noun infrasound

is (physics) sound waves having frequency below the human audible range (below about 20 hz).

As an initialism elf is

(a radical environmentalism group).

As nouns the difference between taxonomy and infrasound

is that taxonomy is the science or the technique used to make a classification while infrasound is (physics) sound waves having frequency below the human audible range (below about 20 hz).