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british
principal focus
noun
Optics
.
focal point
(def 1)
.
Origin of principal focus
First recorded in 1825–35
Words nearby principal focus
principal artery of thumb
,
principal axis
,
principal boy
,
principal clause
,
principal diagonal
,
principal focus
,
principal ideal
,
principal ideal domain
,
principal nursing officer
,
principal optic axis
,
principal parts
British Dictionary definitions for
principal focus
principal focus
noun
another name for
focal point