I BLOOD GROUP SYSTEMS
\a͡ɪ blˈʌd ɡɹˈuːp sˈɪstəmz], \aɪ blˈʌd ɡɹˈuːp sˈɪstəmz], \aɪ b_l_ˈʌ_d ɡ_ɹ_ˈuː_p s_ˈɪ_s_t_ə_m_z]\
Word of the day
international pitch
- the pitch used to tune instruments for concert performances; usually assigns 440 Hz A above middle C