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Eau

Eau is the French word for water. It is used in science, daily language, and many compound terms. The word derives from Latin aqua and is cognate with the English aqua as well as with Spanish agua and Italian acqua.

In French, eau is a feminine noun. It is pronounced roughly "oh" and often appears in phrases

In perfumery, eau appears as a label indicating a lighter fragrance concentration than parfum. Common categories

Beyond fragrance, eau is used in other contexts to denote water in titles and branding, especially in

describing
different
kinds
of
water,
such
as
eau
potable
(drinking
water)
and
eau
chaude
(hot
water).
include
eau
de
parfum,
eau
de
toilette,
and
eau
de
cologne.
Typical
aromatic
compound
ranges
are
about
15–20%
for
eau
de
parfum,
5–15%
for
eau
de
toilette,
and
2–5%
for
eau
de
cologne;
exact
values
vary
by
brand.
French-language
materials.
The
term
remains
central
to
discussions
of
linguistics,
chemistry,
and
consumer
products.