seleno-, selen- +
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.
2. Belonging to the joint action or mutual relations of the earth and moon; as, "geoselenic phenomena".
2. A mock moon; an image of the moon which sometimes appears at the point of intersection of two lunar halos.
A periapsis is the point of an orbit closest to the body being orbited.
2. Selene was the daughter of Hyperion and Theia and the personification of the moon; also, a girl's given name.
2. With the moon being central.
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.
2. Of or pertaining to the center of the moon.
2. The art of picturing the face of the moon.
A cross reference of word units that are related, directly or indirectly, to the: "moon": Calendar, Moon Facts; Chemical Element: selenium; Gods and Goddesses; luna, luni-; Luna, the earth moon; menisc-; meno-; Planets in Motion; plano-.