macrosporangium Meaning, Definition & Usage

  1. noun a plant structure that produces megaspores
    megasporangium.

WordNet

Mac`ro*spo*ran"gi*um noun
Etymology
NL. See Macro-, and Sporangium.
Definitions
  1. (Bot.) A sporangium or conceptacle containing only large spores; -- opposed to microsporangium. Both are found in the genera Selaginella, Isoctes, and Marsilia, plants remotely allied to ferns.

Webster 1913