Etymology
From Middle English ramsons, ramsens, rampsons, ramesones, ramsouns, plural of Middle English ramson, ramsen (“wild garlic”), reinterpreted as a singular form, from Old English hramsan, nominative plural of Old English hramsa (“wild garlic”), from Proto-West Germanic *hramusō, from Proto-Germanic *hramusô (“onion; leek”), from Proto-Indo-European *kremus-, *kermus- (“wild garlic; onion”).
Definitions & examples from Wiktionary (CC BY-SA 3.0).