1》 without clothes.
↘(of an object) without the usual covering or protection.
↘(of a tree, plant, or animal) without leaves, hairs, etc.
↘( ~ of ) devoid of.
↘(of feelings or behaviour) undisguised.
2》 exposed to harm; vulnerable.
the ~ eye unassisted vision, without a telescope, microscope, or other device.
OE nacod , of Gmc origin.