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From Biology-Online Dictionary
1. A furrow, channel, or long hollow, such as may be formed by cutting, molding, grinding, the wearing force of flowing water, or constant travel; a depressed way; a worn path; a rut.
2. Hence: The habitual course of life, work, or affairs; fixed routine. The gregarious trifling of life in the social groove. (j. Morley)
3. [See grove.
(Science: chemical) a shaft or excavation.
Origin: D. Groef, groeve; akin to E. Grove. See grove.