noun, feminine

biréfringence

/bi.ʁe.fʁɛ̃.ʒɑ̃s/

noun, feminine/bi.ʁe.fʁɛ̃.ʒɑ̃s/plural: biréfringences

biréfringence is feminine in French.

birefringence

From bi- + réfringence.