Defn: A tunnel. [Obs.] Shak.

TUNDRA
Tun"dra, n. Etym: [Russ., from a native name.]

Defn: A rolling, marshy, mossy plain of Northern Siberia.

TUNE
Tune, n. Etym: [A variant of tone.]

1. A sound; a note; a tone. "The tune of your voices." Shak.

2. (Mus.) (a) A rhythmical, melodious, symmetrical series of tones for one voice or instrument, or for any number of voices or instruments in unison, or two or more such series forming parts in harmony; a melody; an air; as, a merry tune; a mournful tune; a slow tune; a psalm tune. See Air. (b) The state of giving the proper, sound or sounds; just intonation; harmonious accordance; pitch of the voice or an instrument; adjustment of the parts of an instrument so as to harmonize with itself or with others; as, the piano, or the organ, is not in tune. Like sweet bells jangled, out of tune and harsh. Shak.

3. Order; harmony; concord; fit disposition, temper, or humor; right mood. A child will learn three times as much when he is in tune, as when he . . . is dragged unwillingly to [his task]. Locke.

TUNE
Tune, v. t. [imp. & p. p. Tuned; p. pr. & vb. n. Tuning.]

1. To put into a state adapted to produce the proper sounds; to harmonize, to cause to be in tune; to correct the tone of; as, to tune a piano or a violin. " Tune your harps." Dryden.

2. To give tone to; to attune; to adapt in style of music; to make harmonious. For now to sorrow must I tune my song. Milton.