From The Collaborative International Dictionary of English v.0.48 [gcide]:
Rob \Rob\, n. [F.; cf. Sp. rob, It. rob, robbo, Pg. robe,
arrobe, Ar. rubb, robb, Per. rub.]
The inspissated juice of ripe fruit, obtained by evaporation
of the juice over a fire till it acquires the consistence of
a sirup. It is sometimes mixed with honey or sugar. [Written
also rhob, and rohob.]
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Rhob \Rhob\ (r[o^]b), n.
See 1st Rob.
[1913 Webster]