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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.

See: flow.

4. Symbol for ventilation, frequently with a subscript. See entries under ventilation.

Origin: volume _ overdot denoting time derivative