. "a pressing or resting upon or against, a pressure; a striving, exertion, labor, effort poet. ; nixus in good prose, v. h. v.): pedetentim et sedato nisu, a tread, step : hunc stirps Oceani maturis nisibus Aethra Edidit, pains, throes, labor" . "a pressing or resting upon or against, a pressure; a striving, exertion, labor, effort poet. ; nixus in good prose, v. h. v.): pedetentim et sedato nisu, a tread, step : hunc stirps Oceani maturis nisibus Aethra Edidit, pains, throes, labor" . .