crossline I. \ˈ ̷ ̷ˌ ̷ ̷\noun Etymology:cross (II) + line : a line that crosses something: as a.: a trotline set across a stream b.: a subhead (as between banks) in a newspaper II. adjective Etymology:cross (III) + line (n.) : of, relating to, or being the offspring resulting from the crossbreeding of two pure lines < crossline pigs >