Intranasal
Definition 1 of 2

Context
Intranasal administration is crucial in pharmacology

In many cases, intranasal delivery can be faster than oral routes.
Formality
The term is frequently used in clinical and medical research settings

Using 'intranasally' in casual conversation might confuse some listeners.
Specificity
This term is specific to medical and pharmaceutical fields

Using it correctly requires understanding of anatomy.
Compare with
nasaloralbilingualintravenoustopic
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