semisextile

Century Dictionary and Cyclopedia

1. n. In astrology, an aspect of two planets when they are distant from each other the half of a sextile, or 30 degrees.

Wiktionary

1. n. astrology An aspect of the planets when they are distant from each other the twelfth part of a circle, or thirty degrees.

GNU Webster's 1913

1. n. (Astrol.) An aspect of the planets when they are distant from each other the twelfth part of a circle, or thirty degrees.