Gloss is the brightness or lustre of a surface, that is the extent to which it reflects light. In painting, lustre ranges from flat (the absence of gloss) through eggshell sheens and semi-gloss to full gloss.
In literacy, a gloss is an explanation of some verbal difficulty in a literary work, written at the passage to which it refers. The earliest glosses as those in Greek, Latin, and Hebrew manuscripts were interlinear; they were afterwards placed in the margin, and extended finally in some instances to a sort of running commentary on an entire book. Research Gloss
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Research Gloss