en·do·spore \ˈendə+ˌ-\noun Etymology: International Scientific Vocabulary end- + spore 1.: an asexual spore developed within the cell especially in bacteria — compare exospore 2.: intine 3.: the thin inner layer surrounding the protoplast of a sporozoan spore • en·do·spor·ous\| ̷ ̷ ̷ ̷|spōrəs, (ˈ)en|däspərəs\adjective • en·do·spor·ous·lyadverb