Germanic‎ > ‎East‎ > ‎Gothic‎ > ‎Lexicon‎ > ‎

ei

-ei prt. that, which. (Relative particle).

Rule: When -ei is affixed to a word ending in a short (unstressed) vowel, the vowel is deleted. Long vowels remain. For example:
þata + ei = þatei
þō + ei = þōei (not þei)