open-cell
open-center
open-chain
open-channel
open-circuit
open-coil
open-conductor
open-core
open-cup
open-cut
  open-cycle
open-cylinder
open-deck
open-delta
open-ditch
open-drained
open-end
open-ended
opener
open-face
open-file

    open-cycle gas-core nuclear rocket

    газофазный ядерный ракетный двигатель с открытым циклом