bustl

Welsh

Etymology

From Proto-Celtic *bistlo-: de Vaan notes that the word is only found in Latin (Latin bilis) and Brythonic and does not rule out a substrate borrowing for both; however, it could instead be a derivative of a preform *bid-tli-, from Proto-Indo-European *bʰeyd- (“to split off, bite”), referring to the substance's bitterness. Cognate with Breton bestl.

Noun

bustl m (plural bustlau)

bile, gall, choler

Mutation

Mutated forms of *bustl*
radical	soft	nasal	aspirate
bustl	fustl	mustl	unchanged

Note: Certain mutated forms of some words can never occur in standard Welsh.
All possible mutated forms are displayed for convenience.

References

R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke et al., editors (1950–present), “bustl”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies
De Vaan, Michiel (2008) “bilis”, in Etymological Dictionary of Latin and the other Italic Languages (Leiden Indo-European Etymological Dictionary Series; 7), Leiden, Boston: Brill, →ISBN, page 72