The difference between Extraneous and Intrusive
When used as adjectives, extraneous means not belonging to, or dependent upon, a thing, whereas intrusive means tending to intrude.
Intrusive is also noun with the meaning: an igneous rock that is forced, while molten, into cracks or between other layers of rock.
check bellow for the other definitions of Extraneous and Intrusive
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Extraneous as an adjective:
Not belonging to, or dependent upon, a thing; without or beyond a thing; foreign
Examples:
"to separate gold from extraneous matter"
"Extraneous substances were found on my cup of water."
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Extraneous as an adjective:
Not essential or intrinsic
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Intrusive as an adjective:
Tending to intrude; doing that which is not welcome; interrupting or disturbing; entering without permission or welcome.
Examples:
"Did it ever cross your mind that he might find all those questions you ask intrusive?"
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Intrusive as an adjective (geology):
Of rocks: forced, while in a plastic or molten state, into the cavities or between the cracks or layers of other rocks.
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Intrusive as a noun (geology):
An igneous rock that is forced, while molten, into cracks or between other layers of rock