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| organisms having pairs of homologous chromosomes |
| phase in plant life which begins with a spore produced by meiosis |
| medullary ray | |
| —n | |
| any of the sheets of conducting tissue that run radially through the vascular tissue of some higher plants | |
medullary ray n.
The center of the renal, cortical lobule, consisting of the ascending or descending limbs of the nephronic loop or of the collecting tubules. Also called Ferrein's pyramid.