accidental : Idioms & Phrases
Accidental chords
(Mus.) , those which contain one or more tones foreign to their proper harmony.
Webster 1913
Accidental colors
(Opt.) , colors depending on the hypersensibility of the retina of the eye for complementary colors. They are purely subjective sensations of color which often result from the contemplation of actually colored bodies.
Webster 1913
accidental injury
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noun an accident that results in physical damage or hurt
injury.
WordNet
Accidental lights
(Paint.) , secondary lights; effects of light other than ordinary daylight, such as the rays of the sun darting through a cloud, or between the leaves of trees; the effect of moonlight, candlelight, or burning bodies.
Webster 1913
Accidental point
(Persp.) , the point in which a right line, drawn from the eye, parallel to a given right line, cuts the perspective plane; so called to distinguish it from the principal point, or point of view, where a line drawn from the eye perpendicular to the perspective plane meets this plane.