D defs.my
Entry 1 sense Webster, 1913

doh

/(dō)/ · IPA /doʊ/
01 n. the syllable naming the first (tonic) note of any major diatonic scale in solmization, usually written do.
  1. 1.
    the syllable naming the first (tonic) note of any major diatonic scale in solmization, usually written do. Also: do
Syn. do, ut.