S: (n) slide, glide, coast (the act of moving smoothly along a surface while remaining in contact with it) "his slide didn't stop until the bottom of the hill"; "the children lined up for a coast down the snowy slope"
S: (n) slide, lantern slide (a transparency mounted in a frame; viewed with a slide projector)
S: (n) moulin, glacier mill (a chute through which supraglacial water enters a glacier, boring either to the bedrock or to the depth of common crevasse formation) "the icy river plunged, roaring, into the moulin's blue depths"