Astrol. [f. TRI- + L. octo eight, after quartile, sextile.] An aspect of two planets distant from each other three-eighths of the whole circle, i.e., 135 degrees; the sesquiquadrate.
1727–41. Chambers, Cycl., s.v. Aspect, To the five ancient aspects, the modern writers have added several more; as decile, containing the tenth part of a circle; tridecile,… biquintile,… semisextile,… quincunx…, to the astrological physicians we owe octile, containing one eighth; and trioctile, containing three eighths.
1795. Hutton, Math. Dict., Trioctile,… which some call the sesquiquadrans.
