smiley
Concise Oxford English Dictionary © 2008 Oxford University Press:
smiley /ˈsmʌɪli/ (also smily)
▶adjective (smilier, smiliest) informal smiling; cheerful. ▶noun (pl. smileys or smilies) a symbol representing a smiling face, formed by the characters :-) and used in electronic communications.
'smiley' also found in these Oxford entries:

