Relating to or occurring within a vein, or administered directly into a vein.
From endo- (within) + venous (from Latin vena, vein). This medical term combines the prefix for 'inside' with the word for vein to describe something happening or placed inside veins.
Doctors love this term because it's a quick way to say 'inside the vein' instead of saying the whole thing—it's like medical shorthand that makes conversations in hospitals faster and more precise!
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