seleno-, selen- +

The point of an orbit around the moon farthest from the moon's center.

In astronomy, an apsis (plural apsides) is the point of greatest or least distance of the elliptical orbit of a celestial body from its center of attraction, which is generally the center of mass of the system.

1. Pertaining to the earth and moon.
2. Belonging to the joint action or mutual relations of the earth and moon; as, "geoselenic phenomena".

1. A bright moonlike spot on a lunar halo; a mock moon. Also called moondog.
2. A mock moon; an image of the moon which sometimes appears at the point of intersection of two lunar halos.

Periapsis in orbit around the moon.

A periapsis is the point of an orbit closest to the body being orbited.

1. In Greek mythology, goddess of the moon; identified with the Roman goddess Luna.
2. Selene was the daughter of Hyperion and Theia and the personification of the moon; also, a girl's given name.

An object or structure suggestive of a moon or half-moon.

1. As seen or estimated from the center of the moon.
2. With the moon being central.

In chemistry, pertaining to, or derived from selenium; especially, in its higher valence.

1. A gray, crystalline, nonmetalic element (symbol Se) of the sulfur group, varying greatly in electrical resistance under the influence of light [New Latin from Greek selene the moon].
2. Information is located at Chemical Element: selenium .

In 1818, a Swedish chemist, Jöns Jacob Berzelius, discovered an element very much like telluruium; a kind of "twin sister". Since tellurium had been named after a goddess of the earth, Berzelius decided to balance matters by naming the new element after a goddess of the moon. He chose Selene and named the new element selenium.

1. Having the moon as its center.
2. Of or pertaining to the center of the moon.

The study of the moon's precise shape and gravity field.

Having molars with crescent-shaped cusps that serve to grind fibrous food and which occur in herbivores.

A geological fault in the lunar surface.

1. A description of the moon and its phenomena.
2. The art of picturing the face of the moon.

1. Someone who is versed in selenography.
2. Someone who studies the physical features of the moon.