Usage Note
Intrus derives from the Latin intrusus and is related to the verb s'introduire (to slip in, to enter uninvited); the feminine counterpart is intruse. Note the silent final -s — the word is pronounced 'an-TROO'. It is used for unwelcome gate-crashers, computer intruders, or species that don't belong in an ecosystem.
Examples
"Un intrus s'était glissé dans la réunion."
Natural Translation
An intruder had slipped into the meeting.
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