lilac

noun

li·​lac ˈlī-ˌläk  -ˌlak 

-lək

1

a

: a widely cultivated European shrub (Syringa vulgaris) of the olive family that has cordate ovate leaves and large panicles of fragrant pinkish-purple or white flowers

b

: a tree or shrub congeneric with the lilac

2

: a variable color averaging a moderate purple

Illustration of lilac

• lilac 1a

Examples of lilac in a Sentence

Recent Examples on the Web

Learn when and how to prune lilacs with these expert tips. —Madeline Buiano, Martha Stewart, 2 June 2026

On May 18, the Duchess of Sussex wore a sleeveless lilac shift dress as she was presented with a gift from the World Health Organization in Geneva, Switzerland. —Hannah Malach, InStyle, 1 June 2026

Blues, greens, and lilacs are grounding, and the first two are nature-inspired and convey calmness. —Aliyah Rodriguez, The Spruce, 31 May 2026

Flowers like tree blossoms (lilac, apple, crab apple, pear), violas, marigolds, dahlias and nasturtiums typically bloom first, followed by perennial herbs like thyme, oregano, and chives. —Sara Rosenthal, Denver Post, 27 May 2026

Word History

Etymology

obsolete French (now lilas), from Arabic līlak, from Persian nīlak bluish, from nīl blue, from Sanskrit nīla dark blue

First Known Use

1625, in the meaning defined at sense 1a

Rhymes for lilac

• aback
• attack
• backpack
• backtrack
• bareback
• blackjack
• brownback
• buyback
• callback
• cognac
• comeback
• cutback

Kids Definition

lilac

noun

li·​lac ˈlī-lək  -ˌlak 

-ˌläk

1

: any of a genus of shrubs and trees related to the olive

especially : a European shrub widely grown for its showy clusters of fragrant pink, purple, or white flowers

2

: a medium purple