APPEND'IX, noun plural appendixes. [Latin The Latin plural is appendices. See Append.] 1. something appended or added. Normandy became an appendix to England. 2. An adjunct, concomitant, or appendage. 3. More generally, a supplement or short treatise added to a book.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI