focal 音标拼音: [f'okəl]
a . 焦点的,在焦点上的
焦点的,在焦点上的
focal 焦点
focal adj 1 :
having or localized centrally at a focus ; "
focal point ";
"
focal infection "
2 :
of or relating to a focus ; "
focal length "
Focal \
Fo "
cal \,
a . [
Cf .
F .
focal .
See {
Focus }.]
Belonging to ,
or concerning ,
a focus ;
as ,
a focal point .
[
1913 Webster ]
{
Focal distance ,
or length ,
of a lens or mirror } (
Opt .),
the distance of the focus from the surface of the lens or mirror ,
or more exactly ,
in the case of a lens ,
from its optical center .
{
Focal distance of a telescope },
the distance of the image of an object from the object glass .
[
1913 Webster ]
66 Moby Thesaurus words for "
focal ":
approaching ,
arch ,
asymptotic ,
banner ,
basic ,
bedrock ,
capital ,
cardinal ,
central ,
centralized ,
centred ,
centripetal ,
centrolineal ,
champion ,
chief ,
concentrated ,
concurrent ,
confluent ,
confocal ,
connivent ,
convergent ,
converging ,
crowning ,
dominant ,
essential ,
first ,
foremost ,
fundamental ,
great ,
headmost ,
hegemonic ,
indispensable ,
leading ,
life -
and -
death ,
life -
or -
death ,
magisterial ,
main ,
master ,
material ,
meeting ,
mutually approaching ,
of vital importance ,
overruling ,
paramount ,
predominant ,
preeminent ,
preponderant ,
prevailing ,
primal ,
primary ,
prime ,
principal ,
radial ,
radiating ,
ranking ,
ruling ,
sovereign ,
star ,
stellar ,
substantive ,
supereminent ,
tangent ,
tangential ,
topflight ,
uniting ,
vital
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