The Collaborative International Dictionary of English v.0.48:
Lavender \Lav"en*der\, n. [OE. lavendre, F. lavande, It. lavanda
lavender, a washing, fr. L. lavare to wash; cf. It.
lsavendola, LL. lavendula. So called because it was used in
bathing and washing. See Lave. to wash, and cf.
1. (Bot.) An aromatic plant of the genus Lavandula
(Lavandula vera), common in the south of Europe. It
yields and oil used in medicine and perfumery. The Spike
lavender (Lavandula Spica) yields a coarser oil (oil of
spike), used in the arts.
2. The pale, purplish color of lavender flowers, paler and
more delicate than lilac.
Lavender cotton (Bot.), a low, twiggy, aromatic shrub
(Santolina Cham[ae]cyparissus) of the Mediterranean
region, formerly used as a vermifuge, etc., and still used
to keep moths from wardrobes. Also called ground
Lavender water, a perfume, toilet water, or shaving lotion
containing the essential oil of lavender, and sometimes
the essential oil of bergamot, and essence of ambergris.
Sea lavender. (Bot.) See Marsh rosemary.
To lay in lavender.
(a) To lay away, as clothing, with sprigs of lavender.
(b) To pawn. [Obs.]
[1913 Webster +PJC]