Definition of objective prism
: a transparent prism of small apex angle but large size that is placed in front of the objective of a telescope to cause all stars and other objects to appear as short spectra in the focal plane where they may be photographed together on a single plate of the field
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!
Seen and Heard
What made you want to look up objective prism? Please tell us where you read or heard it (including the quote, if possible).