Words that start with R

Rose quartz is simply quartz containing impurities that gives it a delicate pink colour. It is popular for jewellery, and for carving small ornaments and trinkets from.

Rosemary is a woody evergreen herb that grows into a shrub up to about a metre and a half tall and much wider again. It can be clipped into a hedge or other topiary shapes. It has very strong smelling narrow leaves and purple flowers. It grows well in hot, dry conditions and most varieties tolerate heavy frosts. It does not like being overwatered.
Rosemary goes very well with lamb dishes, but can be used to flavor a variety of other foods too.

Something rots as it breaks into smaller pieces and disintegrates, usually because it is decaying.

A rotor is a machine part that rotates. On a car, a wheel is attached to a rotor which makes the car roll.

Rouge, sometimes called blush, is a red or pink color that is put on your cheeks or lips to make them look nicer.

Rough collies are a long-haired breed of medium-sized to large dog originally used to herd animals in Scotland. They are not a nervous or agressive dog and are good with children. They make good family pets. The most famous rough collie is Lassie, so some people call this kind of dog a Lassie dog.

Something is round if it has the same shape as a circle or a sphere. The hole in the piece of wood in the picture is round.
Round is also a short form of around.

Things are in rows if they are in parallel lines, an equal distance apart.
Things would be in a row if they are spaced equal distances apart, all facing the same way. When you take off your shoes outside someone's house, you line them up in a row.

Rubber is an interesting material that has some interesting properties, including of elasticity - it can be forced out of shape and will snap back to its original shape once you remove the force.
Rubber can be made from either natural latex or manufactured synthetically in a factory.

Rubbish is another word for trash.