noun
lowest part; bottom
Refers to the physical or metaphorical lowest section of something, such as the bottom of a page, screen, list, or hierarchy.
画面の最下部にスクロールしてください。
Please scroll to the bottom of the screen.
この書類の最下部に署名をお願いします。
Please sign at the bottom of this document.
Means 'lower part' or 'bottom section' without the superlative nuance of 最下部.
Compound of 最 (sai, 'most') + 下部 (kabu, 'lower part'). The reading さいかぶ follows standard on'yomi.