Definition of mouth glue in English:

mouth glue

noun

rare, historical
  • A compound of glue and sugar, originally a preparation of isinglass, which becomes adhesive when moistened (typically with the tongue). Also (occasionally): †= "isinglass" (obsolete).

Origin

Late 16th century; earliest use found in John Baret (d. 1578), lexicographer. From mouth + glue.

Pronunciation

mouth glue

/ˈmaʊθ ɡluː/