Strong’s Greek
G2737 — katoteros
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
κατώτερος
katoteros — pronounced kat-o'-ter-os
comparative from 2736; inferior (locally, of Hades):--lower. see GREEK for 2736
1 occurrence in the KJV.
Ephesians 4:9
(Now that he ascended, what is it but that he also descended first into the lower parts of the earth?