[ meg-uh-spaw-ran-jee-uh m, -spoh- ]
/ ˌmɛg ə spɔˈræn dʒi əm, -spoʊ- /

noun, plural meg·a·spo·ran·gi·a [meg-uh-spaw-ran-jee-uh, -spoh-] /ˌmɛg ə spɔˈræn dʒi ə, -spoʊ-/. Botany.

a sporangium containing megaspores.

Origin of megasporangium

First recorded in 1885–90; mega- + sporangium Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for megasporangia

/ (ˌmɛɡəspɔːˈrændʒɪəm) /

noun plural -gia (-dʒɪə)

the structure in certain spore-bearing plants in which the megaspores are formed: corresponds to the ovule in seed plantsCompare microsporangium
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for megasporangia

[ mĕg′ə-spə-rănjē-əm ]

Plural megasporangia

A plant structure in which megaspores are formed, such as those of the female cones of pines.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.