1. (Abbreviation Vision or visual acuity; volt;) unipolar electrocardiogram leads.
2. Symbol for vanadium; valine; volume, frequently with subscripts denoting location, chemical species, and/or conditions.
3. Symbol for gas flow, frequently with subscripts indicating location and chemical species.
4. Symbol for ventilation, frequently with a subscript. See entries under ventilation.
Origin: volume _ overdot denoting time derivative