Old English phonology

Old English phonology is necessarily somewhat speculative since Old English is preserved only as a written language. Nevertheless, there is a very large corpus of the language, and the orthography apparently indicates phonological alternations quite faithfully, so it is not difficult to draw certain conclusions about the nature of Old English phonology.

Old English had a distinction between short and long (doubled) consonants, at least between vowels (as seen in sunne "sun" and sunu "son", stellan "to put" and stelan "to steal"), and a distinction between short vowels and long vowels in stressed syllables. It had a larger number of vowel qualities in stressed syllables – /i y u e o æ ɑ/ and in some dialects /ø/ – than in unstressed ones – /ɑ e u/. It had diphthongs that no longer exist in Modern English, which were /io̯ eo̯ æɑ̯/, with both short and long versions.