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Welsh word cei comes from Proto-Celtic *kagyom (Pen, enclosure.), Latin coacto (I compel, constrain, force.)
*kagyom (Proto-Celtic)
Pen, enclosure.
coacto (Latin)
I compel, constrain, force.
cagiíun (Gaulish)
cagiíum (Gaulish)
*kagyom (Gaulish)
coagulum (Latin)
Curd. Rennet. Thickening, congealing. Tie, bond, binding agent.
caium (Latin)
(Middle Latin) quay, wharf. (Middle Latin) storehouse, shop, workshop.
cail (Old French)
Quay; wharf.
key, keye (Middle English)
cei (Welsh)
Quay.