The Collaborative International Dictionary of English v.0.48:
Roadside \Road"side`\, n. Land adjoining a road or highway; the part of a road or highway that borders the traveled part. Also used ajectively. [1913 Webster]WordNet (r) 3.0 (2006):
roadside n 1: edge of a way or road or path; "flowers along the wayside" [syn: wayside, roadside]