Definition of marram grass noun from the Oxford Advanced Learner's Dictionary

 

marram grass

 noun
noun
BrE BrE//ˈmærəm ɡrɑːs//
 
; NAmE NAmE//ˈmærəm ɡræs//
 
(also marram)[uncountable]
 
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a type of grass that grows in sand, often planted to prevent sand dunes from being destroyed by the wind, rain, etc. Word Origin mid 17th cent.: from Old Norse marálmr, from marr ‘sea’ + hálmr ‘stalk, stem’.
See the Oxford Advanced American Dictionary entry: marram grass