[mez-ahrk, mes-, mee-zahrk, -sahrk] 
| 1. | Botany. (of a primary xylem or root) developing from both the periphery and the center; having the older cells surrounded by the younger cells. |
| 2. | Ecology. (of a sere) originating in a mesic habitat. |
| mes·arch (měz'ärk', měs'-, mē'zärk', -särk') adj. Ecology Originating in a moderately moist habitat. Used of a sere. [mes(o)- + Greek arkhē, beginning.] |
ɑrk