Olfact

Olfact is an English verb meaning to perceive by the sense of smell; to sniff or to detect odors. It is now uncommon in everyday language and is typically encountered in historical, literary, or scientific contexts. The term derives from Latin olfactus "a smelling" and olfacere "to sniff, perceive by smell," and is the etymological root of the noun olfaction and the adjective olfactory.

Usage of olfact is largely restricted to formal, literary, or archaic writing. In modern English, speakers usually substitute smell or sniff. When used, it may appear in older texts or in discussions of linguistic history. Forms of the verb are rare in current usage, with "olfacting" or "olfacted" appearing mainly in niche contexts.

Relation to science and related terms: In biology and neuroscience, the process is described as olfaction, the sense of smell. The olfactory system includes the nasal epithelium, olfactory bulb, and neural pathways to the brain, enabling detection and interpretation of volatile compounds. In humans, olfactory receptor genes number around 400 functional genes, illustrating the genetic basis for a wide range of odors. The term olfact and its derivatives are primarily situated in linguistic or explanatory discussions rather than everyday scientific nomenclature.