coma 音标拼音: [k'omə]
n . 昏迷,麻木,慧发
昏迷,麻木,慧发
coma n 1 :
a state of deep and often prolonged unconsciousness ;
usually the result of disease or injury [
synonym : {
coma },
{
comatoseness }]
2 : (
botany )
a usually terminal tuft of bracts (
as in the pineapple )
or tuft of hairs (
especially on certain seeds )
3 : (
astronomy )
the luminous cloud of particles surrounding the frozen nucleus of a comet ;
forms as the comet approaches the sun and is warmed Coma \
Co "
ma \ (
k [=
o ]"
m [.
a ]),
n . [
NL .,
fr .
Gr .
kw ^
ma lethargy ,
fr .
koima ^
n to put to sleep .
See {
Cemetery }.]
A state of profound insensibility from which it is difficult or impossible to rouse a person .
See {
Carus }.
[
1913 Webster ]
Coma \
Co "
ma \,
n . [
L .,
hair ,
fr .
Gr .
ko `
mh .]
1 . (
Astron .)
The envelope of a comet ;
a nebulous covering ,
which surrounds the nucleus or body of a comet .
[
1913 Webster ]
2 . (
Bot .)
A tuft or bunch , --
as the assemblage of branches forming the head of a tree ;
or a cluster of bracts when empty and terminating the inflorescence of a plant ;
or a tuft of long hairs on certain seeds .
[
1913 Webster ]
{
Coma Berenices }[
L .] (
Astron .),
a small constellation north of Virgo ; --
called also {
Berenice '
s Hair }.
[
1913 Webster ]
Envelope \
En "
vel *
ope \ (?;
277 ),
Envelop \
En *
vel "
op \ (?;
277 ),
n .
[
F .
enveloppe .]
1 .
That which envelops ,
wraps up ,
encases ,
or surrounds ;
a wrapper ;
an inclosing cover ;
esp .,
the cover or wrapper of a document ,
as of a letter .
[
1913 Webster ]
2 . (
Astron .)
The nebulous covering of the head or nucleus of a comet ; --
called also {
coma }.
[
1913 Webster ]
3 . (
Fort .)
A work of earth ,
in the form of a single parapet or of a small rampart .
It is sometimes raised in the ditch and sometimes beyond it . --
Wilhelm .
[
1913 Webster ]
4 . (
Geom .)
A curve or surface which is tangent to each member of a system of curves or surfaces ,
the form and position of the members of the system being allowed to vary according to some continuous law .
Thus ,
any curve is the envelope of its tangents .
4 .
A set of limits for the performance capabilities of some type of machine ,
originally used to refer to aircraft ; --
it is often described graphically as a two -
dimensional graph of a function showing the maximum of one performance variable as a function of another .
Now it is also used metaphorically to refer to capabilities of any system in general ,
including human organizations ,
esp .
in the phrase push the envelope .
It is used to refer to the maximum performance available at the current state of the technology ,
and therefore refers to a class of machines in general ,
not a specific machine .
[
PJC ]
{
push the envelope }
to increase the capability of some type of machine or system ; --
usually by technological development .
[
1913 Webster ]
46 Moby Thesaurus words for "
coma ":
KO ,
blackout ,
catalepsy ,
catatonia ,
catatony ,
dullness ,
encephalitis lethargica ,
faint ,
grayout ,
hebetude ,
high ,
kayo ,
knockout ,
languor ,
lassitude ,
lethargy ,
lipothymia ,
lipothymy ,
narcohypnosis ,
narcolepsy ,
narcoma ,
narcosis ,
narcotic stupor ,
narcotization ,
nirvana ,
nirvana principle ,
nod ,
nothingness ,
oblivion ,
obliviousness ,
sedation ,
semiconsciousness ,
senselessness ,
shock ,
sleep ,
sleeping sickness ,
slumber ,
sopor ,
stupor ,
swoon ,
syncope ,
thanatosis ,
torpidity ,
torpor ,
trance ,
unconsciousness
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