What's the difference between subterrane and subterrene?

Subterrane

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Definition:

• (n.) A cave or room under ground.

Example Sentences:

• (1) The pineal organ of the blind, cave-dwelling fish, Typhlichythyes subterraneous, was examined with both light and electron microscopes.

Subterrene

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Definition:

• (a.) Subterraneous.

Example Sentences: