Ver·tig'i·nous adjective [ Latin vertiginosus , from vertigo a whirling around, giddiness: confer French vertigineux . See Vertig...... .] 1. Turning round; whirling; rotary; revolving; as, vertiginous motion. « Some vertiginous whirl of fort... Found on http://www.encyclo.co.uk/webster/V/19