Search Result for "cedilla": 
Wordnet 3.0

NOUN (1)

1. a diacritical mark (,) placed below the letter c to indicate that it is pronounced as an s;


The Collaborative International Dictionary of English v.0.48:

cedilla \ce*dil"la\ (s[-e]*d[i^]l"l[.a]), n. [Sp. cedilla, cf. F. c['e]dille; dim. of zeta, the Gr. name of the letter z, because this letter was formerly written after the c, to give it the sound of s.] A mark placed under the letter c [thus, [,c]], to show that it is to be sounded like s, as in fa[,c]ade. [1913 Webster]
WordNet (r) 3.0 (2006):

cedilla n 1: a diacritical mark (,) placed below the letter c to indicate that it is pronounced as an s