A round citrus fruit with a bright rind and segmented flesh.

A small open vessel used for drinking.

A coarse mat placed at an entrance for wiping shoes.

A narrow natural channel of flowing water.

Official authorization to carry out a particular activity.

A binding powder that hardens when mixed with water.

The period at the end of the working week, usually Saturday and Sunday.

The daily disappearance of the sun below the horizon.

To move repeatedly back and forth around a fixed point.

The act or ability of bringing stored information back to mind.