from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A twelfth, specifically each of the twelve divisions of the Zodiac.
from the GNU version of the Collaborative International Dictionary of English
- n. A tern applied to the twelve houses, or parts, of the zodiac of the primum mobile, to distinguish them from the twelve signs; also, any one of the twelve signs of the zodiac.
from The Century Dictionary and Cyclopedia
- n. A twelfth part: a term formerly sometimes used for a sign of the zodiac, as being the twelfth part of a circle.
From Ancient Greek δωδεκατημόριον, from δωδέκατος ("twelfth") + μόριον ("piece"). (Wiktionary)
In the terminology of hellenistic period astrological texts, we certainly see that the constellations were often marked with their Dodecatemoria: e.g. the dodecatemory of Libra is.../has... and so on.