any of various plants of the genus Syringa having large panicles of usually fragrant flowers
"The lilacs in my grandmother's garden are blooming today, filling the air with their sweet scent."
A large shrub of the genus Syringa, especially Syringa vulgaris, bearing white, pale-pink, or purple flowers.
"The lilac in my grandmother's garden burst into a cloud of purple blooms every spring."
of a pale purple color
"The garden was filled with the scent of blooming lilacs, their petals displaying that soft, pale purple hue."
Having a pale purple colour.
"The sky turned a soft lilac as the sun began to set behind the mountains."
The word comes from the obsolete French lilas, which was borrowed from the Arabic līlak. It originally referred to a specific plant or flower.