ed

Etymology: Ed is a variant of the Italian conjunction 'e' (and), used before words that begin with a vowel to avoid the hiatus (the awkward sound of two adjacent vowels). It derives from Latin 'et', which also meant 'and'. The 'd' was added as a euphonic element to make pronunciation smoother when connecting words. This phonological phenomenon is similar to the English indefinite article 'a' becoming 'an' before vowels.