supplementary material at the end of a book, article, document, or other text, usually of an explanatory, statistical, or bibliographic nature.

an appendage.

Anatomy .

a process or projection.

vermiform appendix.

Aeronautics . the short tube at the bottom of a balloon bag, by which the intake and release of buoyant gas is controlled.

noun

addendum , addition , adjunct , appendage , appurtenance , attachment , codicil , excursus , index , notes , postscript , rider , sample , supplement , table , verification , epilogue , organ