Correct spelling for the English word "cardiameter" is [kˈɑːdi͡əmˌiːtə], [kˈɑːdiəmˌiːtə], [k_ˈɑː_d_iə_m_ˌiː_t_ə] (IPA phonetic alphabet).
A device for determining the position of the cardia of the stomach.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.