As an adjective it signifies in general any thing belonging to harmony; though in our language the adjective is more properly written harmonical. In this case it may be applied to the harmonical divisions or a monochord; or, in a word, to consonances in general. As a substantive neuter, it imports all the concomitant or accedary sounds which, upon the principles resulting from the experiments made on sonorous bodies, attend any given sound whatever, and render it appretable. Thus all the aliquot parts of a musical string produce harmonical sounds, or harmonics.