(obsolete, thieves' cant) A policeman.

(mathematics) The relation of three quantities in harmonic progression, with the second being a harmonic mean between the first and third, as in the three numbers 2, 3, and 6.

plural of harmonic proportion

(obsolete, thieves' cant) A policeman.

superlative form of harmful: most harmful

A village and civil parish in Richmondshire district, North Yorkshire, England (OS grid ref SE1289).

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.

A village in Worth Matravers parish, Dorset, England, formerly in Purbeck district (OS grid ref SY9880).

preestablished harmony