V. multiply by four, quadruplicate, biquadrate†.
Adj. fourfold, four times; quadrable†, quadrumanous†, quadruple,
quadruplicate, quadrible†; fourth.
quadrifoliate†, quadrifoliolate†, quadrigeminal†, quadrigeminate†,
quadriplanar†, quadriserial†.
Adv. four times; in the fourth place, fourthly.