pseudosphere

noun

pseu·​do·​sphere

ˈsüdō+ˌ-

: a surface of constant negative curvature (as generated by the revolution of a tractrix about its axis)

Word History

Etymology

International Scientific Vocabulary pseud- + sphere: probably originally formed as Italian pseudosfera

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!