Hymn 2: On Fasting, Stanza 24
English:
from the Virgin and all-holy
Mary the immaculate Theotokos; therefore, we fall before you.
Through the entreaties of your mother, give your servants eternal life. (Saint Romanos the Melodist: Hymns of Repentance [trans. Andrew Mellas; Popular Patristics Series 61; Yonkers, N.Y.: St Vladimir’s Seminary Press, 2020], 67)
Greek:
ἐκ τῆς παρθένου καὶ παναγίας
Μαρίας τῆς ἀχράντου Θεοτόκου· διὸ σοὶ προσπίπτομεν·
πρεσβείαις τῆς μητρός σου, δὸς τοῖς δούλοις σου ζωὴν τὴν αἰώνιον. (Ibid., 66)
The term in bold comes from αχραντος, literally, "without stain" (alt. undefiled, immaculate).