Our aristocratic class does not firmly protest against the unfair treatment of Irish Catholics, because it is nervous about the land. --M. Arnold.

Nervous fever (Med.), a low form of fever characterized by great disturbance of the nervous system, as evinced by delirium, or stupor, disordered sensibility, etc.

Nervous system (Anat.), the specialized co["o]rdinating apparatus which endows animals with sensation and volition. In vertebrates it is often divided into three systems: the central, brain and spinal cord; the peripheral, cranial and spinal nerves; and the sympathetic. See Brain, Nerve, Spinal cord, under Spinal, and Sympathetic system, under Sympathetic, and Illust. in Appendix.

Nervous temperament, a condition of body characterized by a general predominance of mental manifestations. --Mayne.

Source: Webster's Revised Unabridged Dictionary (1913)