cyplydd

Welsh

From cyplu (“to couple”) +‎ -ydd, a calque of English coupler.^[1]

cyplydd m (plural cyplyddion)

Mutated forms of *cyplydd*
radical	soft	nasal	aspirate
cyplydd	gyplydd	nghyplydd	chyplydd

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

^ R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke et al., editors (1950–present), “cyplydd”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies