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Great and continued depression of spirits, amounting to mental unsoundness; melancholia.

Not coarse, rough, or harsh; subdued; soft; rich; delicate; -- said of sound, color, flavor, style, etc. "The mellow horn." Wordsworth. "The mellow-tasted Burgundy." Thomson. The tender flush whose mellow stain imbues Heaven with all freaks of light. Percival.

Containing, or producing, melody; musical; agreeable to the ear by a sweet succession of sounds; as, a melodious voice. "A melodious voice." "A melodious undertone." Longfellow. -- Me*lo"di*ous*ly, adv. -- Me*lo"di*ous*ness, n.

A sweet or agreeable succession of sounds. Lulled with sound of sweetest melody. Shak.

celebrated Egyptian statue near Thebes, said to have the property of emitting a harplike sound at sunrise.

ith laughter; mirth; frolic. "Follies and light merriment." Spenser. Methought it was the sound Of riot and ill-managed merriment. Milton.

a pewter or brass pencil, the lines can hardly be effaced. -- Metallic tinking (Med.), a sound heard in the chest, when a cavity communicating with the air passages contains both air and liquid.

With a medium fullness of sound.

Pertaining, or suited, to the audition of small sounds; fitted to assist hearing.

An instrument for intensifying and making audible very feeble sounds. It produces its effects by the changes of intensity in an electric current, occasioned by the variations in the contact resistance of conducting bodies, especially of imperfect conductors, under the action of acoustic vibrations.

Of or pert. to a microphone; serving to intensify weak sounds.

The science which treats of the means of increasing the intensity of low or weak sounds, or of the microphone.

Serving to augment the intensity of weak sounds; microcoustic.

in relation to the palate; midway between the high and the low; -- said of certain vowel sounds; as, a (ale), ê (êll), o (old). See Guide to Pronunciation, §§ 10, 11.

A kind of musical toy into which one sings, hums, or speaks, producing a coarse, reedy sound.

To make a low prolonged sound of grief or pain, whether articulate or not; to groan softly and continuously. Unpitied and unheard, where misery moans. Thomson. Let there bechance him pitiful mischances, To make him moan. Shak.

To form, as sound, to a certain key, or to a certain portion.

Sound modulated; melody. [R.] Thomson.

Momentary. [Obs.] Hooker. "Momentany as a sound." Shak.

An instrument for experimenting upon the mathematical relations of musical sounds. It consists of a single string stretched between two bridges, one or both of which are movable, and which stand upon a graduated rule for the purpose of readily changing and measuring the length of the part of the string between them.…