[eigh.teen] n [ME eightetene, adj., fr. OE eahtatiene, fr. eahta + -tiene; akin to OE tien ten] (bef. 12c): one more than seventeen -- eighteen adj -- eighteen pron, pl in constr -- eigh.teenth adj or n
EIGHTEEN
Meaning of EIGHTEEN in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012