cosyn

Middle English

From Old French cosin (and feminine cosine), inherited from Latin cōnsōbrīnus.

cosyn (plural cosyns)

A member of one's family; one's partner, relative or their partner:
1. One's progeny; those who descend from one's lineage.
2. A nibling (niece or nephew); a child of one's brother or sister
3. One's direct cousin; a child of one's aunt or uncle.
4. (rare) Something bearing similarity to something else.

Originally a singulative form of caws (“cheese”).

cosyn m (plural cosynnau)

(countable) a cheese
- 2021, Cathi McGill, Het Wellt a Welis: Blwyddyn Gron yn Astwrias, Carreg Gwalch, page 30:
  Yn ardal Gamonéu a bwlch Covadonga, uwchlaw'r llynnoedd, cwrddais i â gwraig oedd yn ei hwythdegau bryd hynny, yn byw mewn caban heb ddŵr na thrydan, ffynnon o flaen y drws a thân yn llosgi'n barhaol o dan simnai fawr. Ar y silffoedd o garreg, caws. Cosyn ar ôl cosyn yn aeddfedu yn y mwg.
  In the Gamonéu and Covadonga pass region, above the lakes, I met a woman who was in her eighties at the time, living in a cabin without water or electricity, a well in front of the door and a fire constantly burning under a large chimney. On the stone shelves, cheese. Cheese after cheese maturing in the smoke.

Mutated forms of *cosyn*
radical	soft	nasal	aspirate
cosyn	gosyn	nghosyn	chosyn

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), “caws”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies