hy·per·ne·phro·ma \ˌ ̷ ̷ ̷ ̷nə̇ˈfrōmə, -neˈ-\noun (pluralhypernephromas \-ōməz\ ; orhypernephroma·ta \-məd.ə\) Etymology: New Latin, from Greek hyper- + nephr- + -oma : a tumor of the kidney resembling the adrenal cortex in its histological structure