"inflammation of the kidneys," 1570s, from Late Latin nephritis, from Greek nephritis "disease of the kidneys," from nephros "kidney" (see nephro-) + -itis "inflammation." The earlier word was nefresis (late 14c.), and nefretik (modern nephritic) "affected by a disease of the kidneys" (from Medieval Latin nephreticus) also is from late 14c.
late 14c., infirmite, "disease, sickness; lack of capability, weakness," from Old French infirmité, enfermete "illness, sickness, disease; moral weakness," and directly from Latin infirmitatem (nominative infirmitas) "want of strength, weakness, feebleness," also "the weaker sex" [Lewis], noun of quality from infirmus "weak, frail" (see infirm).
skin disease, Old English teter, from a reduplicated form of PIE root *der- "to split, flay, peel."
1970 in reference to a febrile disease of tropical Africa, from Lassa, name of a village in northeastern Nigeria.
late 14c., "contaminated with dangerous disease; deadly, poisonous," from Latin pestilentem (nominative pestilens) "infected, unhealthy," from pestilis "of the nature of a plague," from pestis "deadly contagious disease" (see pest (n.)). Transferred sense of "mischievous, pernicious, hurtful to health or morals" is from 1510s; weakened sense of "troublesome" is from 1590s. Related: Pestilently.
late 14c., "wasting of the body by disease; wasting disease, progressive emaciation" (replacing Old English yfeladl "the evil disease"), from Old French consumpcion, from Latin consumptionem (nominative consumptio) "a using up, wasting," noun of state from past-participle stem of consumere "to use up, eat, waste," from assimilated form of com-, here perhaps an intensive prefix (see com-), + sumere "to take," from sub- "under" (see sub-) + emere "to buy, take" (from PIE root *em- "to take, distribute"). Meaning "act of consuming, the using up of material, destruction by use" is 1530s.
"extremely fatal infectious disease of dogs, humans, and many other mammals," 1590s, from Latin rabies "madness, rage, fury," related to rabere "be mad, rave" (see rage (v.)). The mad-dog disease sense was a secondary meaning of the Latin noun. Known as hydrophobia (q.v.) in humans. Related: Rabietic.