plural of harmoniphon

Alternative form of harmoniphone

plural of harmonick

The quality of being harmonical.

plural of harmonica bug

An electronic eavesdropping device (bug) that attaches to a landline telephone and is activated or deactivated by a specific tone. When activated, it prevents the telephone from ringing but activates its microphone to transmit to another telephone at a remote location.

The quality of being harmonic.

Alternative form of harmonizable

a nonlinear optical process in which two photons with the same frequency interact with a nonlinear material

plural of second-harmonic generation