plumbago
n . 石墨
石墨
plumbago n 1 :
used as a lubricant and as a moderator in nuclear reactors [
synonym : {
graphite }, {
black lead }, {
plumbago }]
2 :
any plumbaginaceous plant of the genus Plumbago Graphite \
Graph "
ite \,
n . [
Gr .
gra `
fein to write :
cf .
F .
graphite .
See {
Graphic }.] (
Min .)
Native carbon in hexagonal crystals ,
also foliated or granular massive ,
of black color and metallic luster ,
and so soft as to leave a trace on paper .
It is used for pencils (
improperly called lead pencils ),
for crucibles ,
and as a lubricator ,
etc .
Often called {
plumbago }
or {
black lead }.
[
1913 Webster ]
{
Graphite battery } (
Elec .),
a voltaic battery consisting of zinc and carbon in sulphuric acid ,
or other exciting liquid .
[
1913 Webster ]
Plumbago \
Plum *
ba "
go \,
n . [
L .,
from plumbum lead .]
1 . (
Min .)
Same as {
Graphite }.
[
1913 Webster ]
2 . (
Bot .)
A genus of herbaceous plants with pretty salver -
shaped corollas ,
usually blue or violet ;
leadwort .
[
1913 Webster ]
Plumbean
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