semi-infinite

adjective

"+

1

: extending to infinity in one direction or dimension

the propagation of a temperature wave along a semi-infinite rod

2

: limited only by an infinite plane

a semi-infinite metal with a constant flux of heat into its surface

—M. L. Storm

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!