ἑτερήμεροι

[ἕτερος + ἡμέρη.]

Being in a specified condition on alternate days: ἄλλοτε μὲν ζώουσʼ ἑτερήμεροι, ἄλλοτε δʼ αὖτε τεθνᾶσιν Od. 11.303 (the adj. app. qualifying both members of the expression, the sense being that they were in life and in death (presumably both together) on alternate days).