semiquadrate

from The Century Dictionary.

• noun In astrology, an aspect of two planets when distant from each other 45 degrees, or half a quadrant.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Astrol.) An aspect of the planets when distant from each other the half of a quadrant, or forty-five degrees, or one sign and a half.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun astrology An aspect of the planets when distant from each other by half a quadrant, or forty-five degrees, or one sign and a half.