biprism

noun

bi·​prism

ˈbī + ˌ-

: a triangular prism with vertex angle of nearly 180° used to obtain images of a single source in observing the interference of light

called also Fresnel biprism

Word History

Etymology

bi- entry 1 + prism

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

• More than 250,000 words that aren't in our free dictionary
• Expanded definitions, etymologies, and usage notes
• Advanced search features
• Ad free!