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The Collaborative International Dictionary
Trioctile

Trioctile \Tri*oc"tile\ (-[o^]k"t[i^]l), n. [Pref. tri- + octile.] (Astrol.) An aspect of two planets with regard to the earth when they are three octants, or three eighths of a circle, that is, 135 degrees, distant from each other.
--Hutton.

Wiktionary
trioctile

n. (context astrology English) An aspect of two planets with regard to the Earth when they are three octants, or three eighths of a circle (135 degrees), distant from each other.