The Collaborative International Dictionary
Semisextile
Semisextile \Sem"i*sex"tile\, n. (Astrol.)
An aspect of the planets when they are distant from each
other the twelfth part of a circle, or thirty degrees.
--Hutton.
Wiktionary
semisextile
n. (context astrology English) An aspect of the planets when they are distant from each other the twelfth part of a circle, or thirty degrees.