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Princess
Princess Diana
princess feather
Princess Grace of Monaco
Princess of Wales
princess pine
princess royal
Princesse
Princesslike
Princeton
Princeton University
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Princewood
Princified
Principal
Principal axes of a quadric
-- principal axis --
Principal challenge
Principal contract
principal diagonal
Principal focus
principal investigator
Principal obligation
Principal of a quadric
Principal plane
Principal point
Principal ray
Principal section
principal sum
principal type
Principality
Principality of Andorra
Principality of Liechtenstein
principal axis
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Noun
1.
principal axis
-
a
line
that
passes
through
the
center
of
curvature
of
a
lens
so
that
light
is
neither
reflected
nor
refracted
Synonyms:
optic axis
axis
,
optic
axis
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