DENTAL ACID ETCHING
\dˈɛntə͡l ˈasɪd ˈɛt͡ʃɪŋ], \dˈɛntəl ˈasɪd ˈɛtʃɪŋ], \d_ˈɛ_n_t_əl ˈa_s_ɪ_d ˈɛ_tʃ_ɪ_ŋ]\
Word of the day
international pitch
- the pitch used to tune instruments for concert performances; usually assigns 440 Hz A above middle C