[1] : The Collaborative International Dictionary of English v.0.48

zostera \zos"tera\, n. nl. bot.
   a genus of plants of the naiadaceae, or pondweed family.
   zostera marina is commonly known as sea wrack, and
   eelgrass.
   1913 webster
see also:
naiadaceae zostera marina sea wrack eelgrass 

[2] : The Collaborative International Dictionary of English v.0.48

eelgrass \eel"grass`\, n. bot.
   a plant zostera marina, with very long and narrow leaves,
   growing abundantly in shallow bays along the north atlantic
   coast.
   1913 webster
see also:
zostera marina 

[3] : WordNet (r) 2.0

zostera marina
     n : submerged marine plant with very long narrow leaves found in
         abundance along north atlantic coasts syn: eelgrass, grass
         wrack, sea wrack
see also:
eelgrass grass wrack sea wrack 

Zostera >> Z Words
Zostera, definition of term: Zostera
zostera_pag1.html

Marina >> M Words
Marina, definition of term: Marina
marina_pag1.html

Aqua Marina >> A Words
Aqua Marina, definition of term: Aqua Marina
aqua+marina_pag1.html