A sweet, sticky substance deposited on leaves and other plant parts by insects (especially aphids and scale insects) feeding on plant sap, or by fungi.
Adjective
Of a light green colour, like the flesh of some honeydew melons.
Origin
The noun is derived from honey + dew, originally believed to be a form of dew that fell from the sky like rain on to plants (see sense 1).
The adjective is derived from the noun.
Modern English dictionary
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