an apparatus used in radio communications that allows the same antenna to be used for both transmitting and receiving signals
duplexer in American English
(ˈduːpleksər, ˈdjuː-)
noun
Electronics
an automatic electronic switching device that permits the use of the same antenna for transmitting and receiving
Word origin
[1950–55; duplex + -er1]This word is first recorded in the period 1950–55. Other words that entered Englishat around the same time include: Common Market, International Gothic, allograph, bleep, conflict of interest-er is a suffix used in forming nouns designating persons from the object of their occupationor labor (hatter; tiler; tinner; moonshiner), or from their place of origin or abode (Icelander; southerner; villager), or designating either persons or things from some special characteristic or circumstance(six-footer; three-master; teetotaler; fiver; tenner)