hiker UK /ˈhaɪ̯kə/US /ˈhaɪ̯kɚ/ noun1 •One who hikes, especially frequently.The mother looks over her shoulder, and the hiker could swear she gives the weaning calf a dirty look; the time has come for the young animal to enter moosehood, to stop living in two worlds, […] — 1969 formshikers