The word vertiginous traces its lineage to the Latin verb vertere, meaning "to turn," a foundational term with Proto-Indo-European origins in the root wert-, also signifying "to turn, to rotate." From vertere came vertigo, the noun for a spinning sensation. The English adjective was formed by appending the Latinate suffix -ous to the stem vertigin-, directly borrowing the form from the Latin vertiginosus. The semantic logic is transparent: that which is "vertiginous" is literally "full of turning," a description that evolved from the physical sensation of dizziness to metaphorically describe anything, like a great height or rapid change, that induces a similar feeling of disorientation.

Structure: vertigin (revolving) + ous (adjective suffix) - vertigin: Derived from Latin vertigin- (the stem of vertigo), meaning "a whirling, dizziness," from vertere "to turn." Its functional role is the core semantic root. - ous: A suffix of Latin origin (-osus) used to form adjectives meaning "full of, characterized by, having the qualities of."