It is secreted by trees, used by bees, and also etymologically refers to the suburb which binds or seals cities.

propolis |ˈprɒp(ə)lɪs|
a red or brown resinous substance collected by honeybees from tree buds, used by them to fill crevices and to seal and varnish honeycombs.

ORIGIN early 17th cent.: via Latin from Greek propolis ‘suburb,’ also ‘bee glue,’ from pro ‘before’ + polis ‘city.’


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