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Definition of hydra
Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of hydra is as below...
Hydra (n.) Any small
fresh-water
hydroid
of the genus
Hydra,
usually
found
attached
to
sticks,
stones,
etc., by a basal
sucker..
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Terpin
::
Terpin
(n.) A white
crystalline
substance
regarded
as a
hydrate
of oil of
turpentine.
Hydra
::
Hydra (n.) A
southern
constellation
of great
length
lying
southerly
from
Cancer,
Leo, and
Virgo..
Hydroxyl
::
Hydroxyl
(n.) A
compound
radical,
or
unsaturated
group,
HO,
consisting
of one atom of
hydrogen
and one of
oxygen.
It is a
characteristic
part of the
hydrates,
the
alcohols,
the
oxygen
acids,
etc..
Thiophenol
::
Thiophenol
(n.) A
colorless
mobile
liquid,
C6H5.SH,
of an
offensive
odor, and
analogous
to
phenol;
--
called
also
phenyl
sulphydrate..
Centaur
::
Centaur
(n.) A
constellation
in the
southern
heavens
between
Hydra and the
Southern
Cross.
Hydrina
::
Hydrina
(n. pl.) The group of
hydroids
to which the
fresh-water
hydras
belong.
Hydramide
::
Hydramide
(n.) One of a group of
crystalline
bodies
produced
by the
action
of
ammonia
on
certain
aldehydes.
Seminose
::
Seminose
(n.) A
carbohydrate
of the
glucose
group found in the
thickened
endosperm
of
certain
seeds,
and
extracted
as
yellow
sirup
having
a
sweetish-bitter
taste..
Hydrargyrum
::
Hydrargyrum
(n.)
Quicksilver;
mercury.
Hydroxide
::
Hydroxide
(n.) A
hydrate;
a
substance
containing
hydrogen
and
oxygen,
made by
combining
water with an
oxide,
and
yielding
water by
elimination.
The
hydroxides
are
regarded
as
compounds
of
hydroxyl,
united
usually
with basic
element
or
radical;
as,
calcium
hydroxide
ethyl
hydroxide..
Verditer
::
Verditer
(n.)
Either
one of two
pigments
(called
blue
verditer,
and green
verditer)
which are made by
treating
copper
nitrate
with
calcium
carbonate
(in the form of lime,
whiting,
chalk,
etc.) They
consist
of
hydrated
copper
carbonates
analogous
to the
minerals
azurite
and
malachite..
Sterile
::
Sterhydraulic
(a.)
Pertaining
to, or
designating,
a kind of
hydraulic
press;
resembling
such a press in
action
or
principle..
Hydrate
::
Hydrate
(n.) A
substance
which does not
contain
water as such, but has its
constituents
(hydrogen,
oxygen,
hydroxyl)
so
arranged
that water may be
eliminated;
hence,
a
derivative
of, or
compound
with,
hydroxyl;
hydroxide;
as, ethyl
hydrate,
or
common
alcohol;
calcium
hydrate,
or
slaked
lime..
Mercury
::
Mercury
(n.) A
metallic
element
mostly
obtained
by
reduction
from
cinnabar,
one of its ores. It is a
heavy,
opaque,
glistening
liquid
(commonly
called
quicksilver),
and is used in
barometers,
thermometers,
ect.
Specific
gravity
13.6.
Symbol
Hg
(Hydrargyrum).
Atomic
weight
199.8.
Mercury
has a
molecule
which
consists
of only one atom. It was named by the
alchemists
after the god
Mercury,
and
designated
by his
symbol,
/..
Hydraulic
::
Hydraulic
(a.) Of or
pertaining
to
hydraulics,
or to
fluids
in
motion;
conveying,
or
acting
by,
water;
as, an
hydraulic
clock,
crane,
or
dock..
Hydrating
::
Hydrating
(p. pr. & vb. n.) of
Hydrat.
Cryohydrate
::
Cryohydrate
(n.) A
substance,
as salt,
ammonium
chloride,
etc., which
crystallizes
with water of
crystallization
only at low
temperatures,
or below the
freezing
point of
water..
Hydraulical
::
Hydraulical
(a.)
Hydraulic.
Theca
::
Theca (n.) The
chitinous
cup which
protects
the
hydranths
of
certain
hydroids.
Water Mite
::
Water mite () Any of
numerous
species
of
aquatic
mites
belonging
to
Hydrachna
and
allied
genera
of the
family
Hydrachnidae,
usually
having
the legs
fringed
and
adapted
for
swimming.
They are often red or red and black in
color,
and while young are
parasites
of
fresh-water
insects
and
mussels.
Called
also water tick, and water
spider..
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