A metric unit of length equal to one millionth of a meter.
synonym: micron.
Roget 200:
length,
longitude,
span;
mileage;
distance
etc.
196.
line,
bar,
rule,
stripe,
streak,
spoke,
radius.
lengthening
etc.
v.;
prolongation,
production,
protraction;
tension,
tensure†;
extension.
[Measures of length]
line,
nail,
inch,
hand,
palm,
foot,
cubit,
yard,
ell,
fathom,
rood,
pole,
furlong,
mile,
league;
chain,
link;
arpent†,
handbreadth†,
jornada [U.S.],
kos†,
vara†.
[astronomical units of distance]
astronomical unit,
AU,
light-year,
parsec.
[metric units of length]
nanometer,
nm,
micron,
micrometer,
millimicron,
millimeter,
mm,
centimeter,
cm,
meter,
kilometer,
km.
pedometer,
perambulator;
scale
etc.
(measurement)
466.
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Roget 193:
littleness
etc.
adj.;
smallness
etc.
(of quantity)
32;
exiguity,
inextension†;
parvitude†,
parvity†;
duodecimo†;
Elzevir edition,
epitome,
microcosm;
rudiment;
vanishing point;
thinness
etc.
203.
dwarf,
pygmy,
pigmy†,
Liliputian,
chit,
pigwidgeon†,
urchin,
elf;
atomy†,
dandiprat†;
doll,
puppet;
Tom Thumb,
Hop-o'-my-thumb†;
manikin,
mannikin;
homunculus,
dapperling†,
cock-sparrow.
animalcule,
monad,
mite,
insect,
emmet†,
fly,
midge,
gnat,
shrimp,
minnow,
worm,
maggot,
entozoon†;
bacteria;
infusoria†;
microzoa [Micro.];
phytozoaria†;
microbe;
grub;
tit,
tomtit,
runt,
mouse,
small fry;
millet seed,
mustard seed;
barleycorn;
pebble,
grain of sand;
molehill,
button,
bubble.
point;
atom
etc.
(small quantity)
32;
fragment
etc.
(small part)
51;
powder
etc.
330;
point of a pin,
mathematical point;
minutiae
etc.
(unimportance)
643.
micrometer;
vernier;
scale.
microphotography,
photomicrography,
micrography†;
photomicrograph,
microphotograph;
microscopy;
microscope
(optical instruments)
445.
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Dutch: micrometer
Polish: mikrometr, mikron, μm