This root form (lemma) is used in 2 different forms in the NT: Ἐρυθρὰν (AFS), Ἐρυθρᾷ (DFS).
It is glossed in 2 different ways: ‘the Red’, ‘Red’.
OET ACTS 7:36 Greek word=Ἐρυθρᾷ (Eruthra) Morphology=DFS English gloss=‘the Red’ SR GNT ACTS 7:36 word 16
OET HEB 11:29 Greek word=Ἐρυθρὰν (Eruthran) Morphology=AFS English gloss=‘Red’ SR GNT HEB 11:29 word 4