I. ā-ˈzī-gəs noun
Etymology: New Latin, from Greek, unyoked, from a- + zygon yoke — more at yoke
Date: 1646
: an azygos anatomical part
II. adjective
also azy·gous (ˌ)ā-ˈzī-gəs
Date: 1681
: not being one of a pair : single
an azygos vein
I. ā-ˈzī-gəs noun
Etymology: New Latin, from Greek, unyoked, from a- + zygon yoke — more at yoke
Date: 1646
: an azygos anatomical part
II. adjective
also azy·gous (ˌ)ā-ˈzī-gəs
Date: 1681
: not being one of a pair : single
an azygos vein
Merriam-Webster's Collegiate English vocabulary. Энциклопедический словарь английского языка Merriam Webster. 2003