liner1Pronunciation: /ˈlʌɪnə/Translate liner | into French | into German | into Italian | into Spanish Definition of liner noun 1 (also ocean liner) a large luxurious passenger ship of a type formerly used on a regular line. 2a fine paintbrush used for painting thin lines and for outlining. a cosmetic used for outlining or accentuating a facial feature, or a brush or pencil for applying this. 3a boat engaged in sea fishing with lines as opposed to nets. 4a ferret held on a leash or line while rabbiting, used to help recover another ferret lost underground. liner in other Oxford dictionaries Definition of liner in the US English dictionary