to exhibit a play of colors like that of the iridescent gem opal.

leafage; foliage.

to flee or depart suddenly, especially without having paid one's bills.

a reflection or thought.

consisting of land and water, as the earth.

either of the apparent extremities of the rings of Saturn or of other planets, especially when viewed from the earth or from spacecraft under certain conditions, when they look like two handles.

the observation and study of the planet Mars.

a periodic irregularity in the moon's motion, caused by the attraction of the sun.

pertaining to the rising of the Dog Star (also called Sirius) or to the star itself.

the point at which the stars of a binary system are farthest apart.