plasmodesma
noun
plas·mo·des·ma ˌplaz-mə-ˈdez-mə 
variants or less commonly plasmodesm
ˈplaz-mə-ˌde-zəm
plural plasmodesmata ˌplaz-mə-ˈdez-mə-tə or plasmodesmas ˌplaz-mə-ˈdez-məz
or plasmodesmas ˌplaz-mə-ˈdez-məz : one of the cytoplasmic strands passing through openings in some plant cell walls and forming connections with adjacent cells
Word History
Etymology
New Latin plasmodesma, from plasma + Greek desmat-, desma bond, from dein to bind — more at diadem
First Known Use
1905, in the meaning defined above