Roseate-eous,-ens: rose colored: pale blood red [rose].
Rosette-shaped: in the form of a double rose: clustered round a centre.
Rostellum: a small beak; applied to the mouth parts of sucking lice: also used in Hemiptera, as = rostrum; q.v.
Rostral: pertaining or attached to a rostrum; specifically of Hemiptera.
Rostrate: the head, when it has a long protraction bearing the mouth parts.
Rostriform: produced like a beak or snout.
Rostrum: a snout-like prolongation of the head: in Coleoptera, applied to the rigid extension in the snout beetles: in Hemiptera, is the jointed beak covering the piercing lancets; and this is the better use of the term.
Rotate: wheel-shaped.
Rotator: used for turning; applied to muscles.
Rotatory: an articulation that permits a rotating motion, e.g. a ball and socket joint.