Definify.com
Webster 1913 Edition
Rosmarine
1. 
Dew from the sea; sea dew. 
[Obs.] 
That purer brine
And wholesome dew called
And wholesome dew called
rosmarine
. B. Jonson.
2. 
Rosemary. 
[Obs.] 
Spenser. 
“Biting on anise seed and rosmarine.” Bp. Hall. 
 Ros′ma-rine
,Noun.
 [Norw. 
rosmar 
a walrus; ros 
a horse (akin to E. horse
) + (probably) mar 
the sea.] A fabulous sea animal which was reported to climb by means of its teeth to the tops of rocks to feed upon the dew. 
And greedly 
rosmarines 
with visages deforme. Spenser.