From Wiktionary, the free dictionary
From plym(i)o (“to plum, to plummet, to dive; to plumb, to work as a plumber”) + -wyr.
plymwyr
- plural of plymiwr (“diver”)
- plural of plymwr (“plumber”)
Note: Certain mutated forms of some words can never occur in standard Welsh.
All possible mutated forms are displayed for convenience.