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Wiktionary
pseudoterminal

n. (context computing English) A pair of pseudodevices that can communicate with each other without the hardware that a true device would require.

Wikipedia
Pseudoterminal

In some operating systems, including Unix, a pseudoterminal, pseudotty, or PTY is a pair of pseudo-devices, one of which, the slave, emulates a real text terminal device, the other of which, the master, provides the means by which a terminal emulator process controls the slave.