Try this:
https://www.merriam-webster.com/dictionary/walm
The origin and etymology of Walm:
It's Middle English and means 'bubbling of water', from the Old English waelm (I can't get the Anglo Saxon grapheme 'ash' on my keyboard so I've put a separate a and e) or wielm, the action of boiling or bubbling, similar to the Old High German walm (action of boiling) or old English weallan or wyllan (to bubble or well).
Alternatively you can try this one, it's an Anglo-Saxon dictionary:
http://bosworth.ff.cuni.cz/035801
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