contraplex, a.
(ˈkɒntrəplɛks)
[f. L. contrā adv. + -plex -fold, as in simplex, duplex, etc.]
Telegr. Having two currents or messages passing in opposite directions at the same time.
| 1879 Prescott Sp. Telephone 346 The terms contraplex and diplex are here applied as specific names for designating clearly the way in which the particular simultaneous double transmission..is effected. |