glide
1. glide \'gli-d\ vb [ME gliden, fr. OE gli-dan; akin to OHG gli-tan to glid]e 1: to move smoothly, continuously, and effortlessly 2: to pass gradually and imperceptibly of an airplane 3: to descend at a normal angle without engine power sufficient for level flight of the tongue 4: to change position in the articulation of a glide : to cause to glide 2. glide n 1: the act or action of gliding 2: a calm stretch of shallow water flowing smoothly 3a: PORTAMENTO 3b: a nonsignificant sound produced by the passing of the vocal organs to o r from the articulatory position of a speech sound
Webster's English Dictionary