The story
- Old English · inherited fromseldsīene
- Middle English · inherited fromseldscene
- English todayseldseen
From Middle English seldscene, seltsene (“rarely encountered, seldom seen; rare; as adv. seldom, rarely”), from Old English seldsīene, seldsēne (“rare, extraordinary, unfamiliar, uncommon”). Cognate with Old High German seltsāni, Modern German seltsam.
Etymology from Wiktionary, CC BY-SA 4.0.