As nouns the difference between obtusion and obtrusion
is that obtusion is the blunting, dulling, or weakening of normal sensation while obtrusion is an interference or intrusion.
obtusion
English
Noun
(-)
(medicine) The blunting, dulling, or weakening of normal sensation.
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obtrusion
English
Noun
(
en noun)
An interference or intrusion
An encroachment beyond proper limits