roller coaster : Dictionary / Wörterbuch (BEOLINGUS, TU Chemnitz)

English Dictionary: roller coaster	by the DICT Development Group
2 results for roller coaster
From WordNet (r) 3.0 (2006) [wn]:
roller coaster n anything characterized by abrupt and extreme changes (especially up and down); "the economy has been on a roller coaster all year" elevated railway in an amusement park (usually with sharp curves and steep inclines) Synonym(s): roller coaster, big dipper, chute-the-chute
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Roller coaster \Roller coaster\ An amusement railroad in which cars coast by gravity over a long winding track, with steep pitches and ascents.