/ sɪˈdɪlə; NAmE / noun
the mark placed under the letter c in French, Portuguese, etc. to show that it is pronounced like an s rather than a k ; a similar mark under s in Turkish and some other languages
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WORD ORIGIN
late 16th cent.: from obsolete Spanish , earlier form of zedilla , diminutive of zeda (the letter Z), from Greek zēta .