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helmet
noun
a
hard
protective
covering
worn
on
the
head
to
prevent
injury
•
Before
riding
his
bicycle
,
Tom
fastened
his
helmet
securely
.
Before
riding
his
bicycle
,
Tom
fastened
his
helmet
securely
.
•
The
construction
worker
lifted
his
helmet
to
wipe
away
sweat
.
The
construction
worker
lifted
his
helmet
to
wipe
away
sweat
.
Middle
English
,
from
Old
French
‘
helmet
’ (
diminutive
of
helm
),
originally
meaning
a
small
protective
head
covering
.
noun
the
hood-like
,
dome-shaped
part
of
certain
flowers
formed
by
a
curved
petal
or
group
of
petals
•
The
orchid
’
s
purple
helmet
curved
over
the
pollen
inside
.
The
orchid
’
s
purple
helmet
curved
over
the
pollen
inside
.
•
Botanists
explained
that
the
flower
’
s
helmet
attracts
bees
.
Botanists
explained
that
the
flower
’
s
helmet
attracts
bees
.
Extended
sense
from
the
protective
headgear
,
dating
to
the
18th
century
in
botanical
Latin
when
the
curved
petal
was
likened
to
a
soldier
’
s
helmet
.
