1. Ectasian - Adjective
2. Ectasian - Proper noun
Ectasian (comparative more Ectasian, superlative most Ectasian)
(geology) Of a geologic period within the Mesoproterozoic era from about 1400 to 1200 million years ago.
Ectasian
(geology) The Ectasian period.