Home › Words › T › tannosometannosometannosome means A kind of organelle found in vascular plants, formed when the chloroplast membrane forms pockets filled with tannin.Among words judged in Lexicurio's Arena, tannosome ranks #27,093 of 42,747 for Qualifying.EtymologyBy surface analysis, tanno- + -some.nounA kind of organelle found in vascular plants, formed when the chloroplast membrane forms pockets filled with tannin.Definitions & examples from Wiktionary (CC BY-SA 3.0).