noun
warichū; interlinear notes; split annotation
A printing and typesetting term for notes inserted between lines of main text, often set in smaller type. Also refers to the technique of splitting a line into two half-sized columns for parenthetical comments. The loanword 'warichū' is used in English typography discussions.
古文書の割り注を読むのは難しい。
Reading the interlinear notes in old documents is difficult.
この版では、注釈が割り注として本文の間に組まれている。
In this edition, the annotations are typeset as warichū between the lines of the main text.
Compound of 割り (wari, 'splitting') + 注 (chū, 'annotation'). The term describes the typographic practice of splitting a line to insert notes.