gloss

\ \ English has two words gloss. The one meaning ‘shining surface’ [16] is of unknown origin, although no doubt it belongs ultimately to the general nexus of words beginning gl- which mean broadly ‘bright, shining’. Forms such as Icelandic glossi ‘spark’ and Swedish dialect glossa ‘glow’ suggest a Scandinavian origin. Gloss ‘explanation, definition’ [16] goes back to Greek glossa ‘tongue’, source also of English epiglottis [17]. This developed the secondary sense ‘language’ (as English tongue itself has done), and was borrowed by Latin as glōssa meaning ‘foreign word needing an explanation’, and eventually the ‘explanation’ itself. It passed into English via medieval Latin glōsa and Old French glose as gloze in the 14th century, and was reformulated as gloss on the basis of classical Latin glōssa in the 16th century. Glossary [14] comes from the Latin derivative glossārium.

\ \ Cf.⇒ EPIGLOTTIS, GLOSSARY