mesarch adjective. ['mɛzɑ:k, 'mi:z-, -s-] L19.
[from MESO- + Greek arkhē beginning, origin.]
1. Botany. Of primary xylem: developing both from the centre of the stem and the periphery. L19.

2. Ecology. Of a succession of plant communities: originating in a mesic or moderately moist habitat. E20.

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