A person who is in better health or doing better, or someone who becomes well.
From 'well' (Old English 'wel', meaning in good health) plus the agent suffix '-er'. Historically rare, it emerged as a natural word formation in English but never became common in standard usage.
This word is so underused it's almost invisible, yet it perfectly describes what everyone hopes to be during cold season—a weller, someone getting back to normal after being sick.
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