WordNet sense 1 (an explanation or definition of an obscure word in a text):

rubric

WordNet sense 2 (an alphabetical list of technical terms in some specialized field of knowledge; usually published as an appendix to a text on that field):

glossary

WordNet sense 3 (the property of being smooth and shiny):

burnish, glossiness, polish, polish

WordNet sense 4 (an outward or token appearance or form that is deliberately misleading):

color, semblance, colour

WordNet sense 5 (provide interlinear explanations for words or phrases):

annotate, comment