12-letter words starting with ro
- rough collie — a breed of long-haired collie with a coarse black-and-white or black, tan, and white coat, thicker around its neck and shoulders.
- rough-spoken — coarse or vulgar in speech.
- rough-voiced — having a harsh or grating voice: a rough-voiced barker.
- roughhousing — the act of behaving in a boisterous or rough way
- round barrow — a funerary barrow having a bell, disk, saucer, or pond shape, primarily of the Bronze Age and containing the cremated remains of corpses along with grave artifacts.
- round window — a membrane-covered opening in the inner wall of the middle ear that compensates for changes in cochlear pressure.
- round-lotter — a buyer or seller of round lots.
- roundaboutly — in a roundabout manner
- rous sarcoma — a malignant tumor occurring in the connective tissue of poultry, caused by a transmissible RNA-containing virus.
- route survey — a survey for determining the route, grades, etc., of a railroad, highway, or power line.
- router patch — a plywood panel patch with parallel sides and rounded ends.
- royal antler — the third prong from the base of a stag's antler.
- royal assent — (in Britain) the formal signing of an act of Parliament by the sovereign, by which it becomes law
- royal colony — a colony ruled or administered by officials appointed by and responsible to the reigning sovereign of the parent state.
- royal family — the immediate family of a reigning monarch.
- royal octavo — a book size, 61⁄4 by 10 inches
- royal pardon — release from punishment for an offence, granted by a monarch
- royal purple — a deep bluish purple.
- royal quarto — a book size, 10 by 121⁄2 inches
- royal tennis — court tennis.