| checker1 |
one of the disks used as a game piece in checkers. Checkers is a game played by two people. Each player has twelve pieces to move over a board divided into sixty-four squares of two alternating colors. |
| checkerboard |
a surface marked into sixty-four squares of two alternating colors. It is used as a game board for checkers or chess. |
| checkers |
(plural but used with a singular verb) a game played by two people. Each player has twelve pieces to move over a board divided into sixty-four squares of two alternating colors. |
| dinosaur |
one of a group of extinct animals. Some kinds of dinosaurs were the largest animals that ever lived on land. Other dinosaurs were as small as chickens. The first kinds of dinosaurs developed over two hundred million years ago. The last kinds became extinct about sixty-five million years ago. |
| gale |
a strong wind of about thirty to sixty miles per hour. [1/2 definitions] |
| hour |
a unit of time equal to sixty minutes. [1/4 definitions] |
| middle age |
the period of human life between youth and old age, or the years between forty and sixty-five. |
| middle-aged |
of a person, being of an age between youth and old age. A middle-aged person is often between forty and sixty-five years of age. |
| minute1 |
a unit of time equal to sixty seconds or one sixtieth of an hour. (abbreviated: min.) [1/4 definitions] |
| pterodactyl |
a flying reptile that lived at the same time as dinosaurs. Pterodactyls had wings covered with skin. Some were huge and glided over the oceans and caught fish. They became extinct over sixty-five million years ago. |
| senior citizen |
an older person, especially one who is past the age of sixty-five and retired. |
| seventieth |
coming next after the sixty-ninth in a series. [2/3 definitions] |
| sixtieth |
one of sixty equal parts of a whole; 1/60. [1/3 definitions] |
| sixty |
being sixty in number. [1/2 definitions] |