1. 
   Perianthium
   Per`i·an'thi·um noun [ New Latin ] (Botany) The perianth.
   Found op http://www.encyclo.co.uk/webster/P/54
   
   
2. 
   perianthium
   Synonym for perianth ... <plant biology> The calyx and corolla of a flower, especially where the two are similar. ... (09 Oct 1997) ...
   Found op http://www.mondofacto.com/facts/dictionary?perianthium
   
   
3. 
   Perianthium
   • (n.) The perianth.
   Found op http://thinkexist.com/dictionary/meaning/perianthium/
   
   
4. 
   Perianthium
   Perianth, or skullcap (grch. cover, lid) on the flower bud ; see there.
   Found op http://www.wein-plus.eu/en/Perianthium_3.0.6715.html
   
   

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