refringence


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re·frin·gence

 (rĭ-frĭn′jəns)
n.
Refractive power.
References in periodicals archive ?
Sperm packages (preserved in 80% ethanol): "head" portion visible by refringence as a darker area on the anterior third of the package, helicoidal in shape; medially corrugated; "tail" straight, becoming acute posteriorly, showing small granulations (some packages stick to each other at this point).