(a) The science or principles of human conduct, ethics; (b) a particular system of ethics, a discussion of moral principles; esp., the ethical treatises of Aristotle (often pl.). …

(a) Med. A continuous or recurring, wasting fever [said to result from ulcers, the 'stone', faulty diet, emotional disturbances, etc., but especially associated with tuberculosis], hectic fever; --……

(a) fever etik, hectic fever; (b) of persons: suffering from hectic fever; ?consumptive. …

A specific instance illustrating a general truth. …

A clever method, cleverness. …