M.E. coste, from O.Fr., from L. costa "rib, side," cf. Mid.Pers. kust, kustag "side, direction; district," Mod.Pers. xost, xwast "a beaten road; island;" PIE *kost- "leg, bone."
Rahâraftan, from rahâ "free, set free" (O.Pers. rad- "to leave," Skt. rah-, rahati "separates, leaves," Av. razah- "isolation;" PIE *redh-) + raftan "to go, walk" (Mid.Pers. raftan, raw-, Proto-Iranian *rab/f- "to go; to attack").
Fr.: vol d'accostage
The unpowered flight of a spacecraft or missile after propulsion cutoff or between the burnout of one stage and the ignition of the next.
Fr.: Univers à densité critique
A Universe whose density is just less than or equal to the critical value and expands forever with no change in the expansion rate.