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Negi is a particular type of bunching onion - that is, an onion that does not form a bulb at the bottom. It's somewhere in between a leek and a scallion or spring onion in thickness and texture. I have seen it translated as Welsh onion, though it's not exactly the same.
Negi A, Marmor MF. Experimental serous retinal detachment and focal pigment epithelial damage. Arch Ophthalmol. 1984 Mar. 102(3):445-9. . Negi A, Marmor MF. The resorption of subretinal fluid after diffuse damage to the retinal pigment epithelium. Invest Ophthalmol Vis Sci. 1983 Nov. 24(11):1475-9. .