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plural nefs
An extravagant table ornament and container used in the Middle Ages and Renaissance, made in the shape of a ship. examples
not comparable
(algebraic geometry) Of a line bundle on a complete algebraic variety over a field: such that the degree of its restriction to every algebraic curve in the variety is non-negative. quotations examples
[…] this condition is the numerical consequence of the condition that for some m > 0 {\displaystyle m>0} , the linear system | m D | {\displaystyle |mD|} is effective and free; thus nef = "numerically (effective and free)".
1983, Miles Reid, “Minimal Models of Canonical 3-Folds”, in Advanced Studies in Pure Mathematics, volume 1, page 131