the branch of astronomy that deals with the charting of the moon's surface.

any elementary particle that is subject to the interaction responsible for the short-range attractive force that holds together the nucleus of the atom.

regal, lofty, or stately dignity; imposing character; grandeur.

the head of a school.

to form of small squares or blocks, as floors or pavements; form or arrange in a checkered or mosaic pattern.

a male admirer or lover.

the animals of a given region or period considered as a whole.

moderately slow and even.

a record or account arranged in the order of a calendar.

a school, attended in addition to one's regular school, where students prepare for college entrance examinations.