A circular road junction where traffic travels around a central island.

An instrument that indicates the hour from the shadow cast by sunlight.

A standard used to judge, compare, or decide something.

A reasoned response intended to disprove an opposing claim.

The perforated fitting that spreads water into many small streams.

A green kernel enclosed in a shell that splits as it ripens.

A powered saw with a narrow blade that moves rapidly up and down.

To move at a horse's fastest four-beat pace.

A chain or cluster of islands within the same stretch of sea.

A ridge of stones and sediment deposited along a moving mass of ice.