glis·sade 
(glĭ-säd, -sād)
(glĭ-säd, -sād)n.
1. A gliding step in ballet.
2. A controlled slide, in either a standing or sitting position, used in descending a steep snow slope.
intr.v. glis·sad·ed, glis·sad·ing, glis·sades
To perform a glissade.
[French, from glisser, to slide, from Old French, possibly alteration (influenced by glacer, to slide) of glier, to glide, of Germanic origin; see ghel-2 in the Appendix of Indo-European roots.]
glis·sader n.