Definition of: archespore

(är′kə·spôr, -spōr) noun Bot.
The cell, or group of cells, from which the pollen mother cells are formed within a pollen sac, or the spore mother cells within a sporangium. Also ar′che·spo′ri·um (-spôr′ē·əm, spō′rē·əm). [<NL archesporium <ARCHI- + Gk. sporos seed]
—ar′che·spo′ri·al adjective