Dictionary.com
Thesaurus.com

mestome

British  
/ ˈmɛstəʊm /

noun

  1. botany

    1. conducting tissue associated with parenchyma

    2. ( as modifier )

      a mestome sheath

"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

Etymology

Origin of mestome

C19: from Greek mestōma filling up