subtonic

[ suhb-ton-ik ]
/ sʌbˈtɒn ɪk /

noun

the seventh tone of a scale, being the next below the upper tonic.

Origin of subtonic

First recorded in 1825–35; sub- + tonic

British Dictionary definitions for subtonic

subtonic
/ (sʌbˈtɒnɪk) /

noun

music the seventh degree of a major or minor scale Also called: leading note