ἀ

ἀ‐ as a prothetic vowel, usually before a double consonant, as ἀ‐βληχρός, ἀ‐σπαίρω; sts. before a single consonant, as ἀ‐μέλγω; before a vowel where v is lost, as ἀ‐vείδω. [α.]