noun the line at which the sky and Earth appear to meet
visible horizon; skyline; horizon; apparent horizon.
. See Horizon, n., 2. (a).
Sensible note ∨ tone
(Mus.), the major seventh note of any scale; so called because, being but a half step below the octave, or key tone, and naturally leading up to that, it makes the ear sensible of its approaching sound. Called also the leading tone.