Etymology
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lilac (n.)

1590s, shrub of genus Syringa with mauve flowers, with French lilac, Spanish lilac from Turkish leylak (the tree reached Western Europe via Istanbul), perhaps from a native Balkan name. Attested from 1791 as a color name; as a scent, from 1895. As an adjective, "pale pinkish-purple," from 1801. Related: Lilaceous.

updated on July 06, 2017

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Definitions of lilac from WordNet
1
lilac (n.)
any of various plants of the genus Syringa having large panicles of usually fragrant flowers;
2
lilac (adj.)
of a pale purple color;
Synonyms: lavender / lilac-colored
From wordnet.princeton.edu, not affiliated with etymonline.