"study of diseases, systematic classification of diseases," 1721, from Modern Latin nosologia (perhaps via French nosologie); see noso- "disease" + -logy "study of." Related: Nosological; nosologist.
Entries linking to nosology
noso-
word-forming element meaning "disease," from Greek nosos "disease, sickness, malady," a word of unknown origin.
-logy
word-forming element meaning "a speaking, discourse, treatise, doctrine, theory, science," from Greek -logia (often via French -logie or Medieval Latin -logia), from -log-, combining form of legein "to speak, tell;" thus, "the character or deportment of one who speaks or treats of (a certain subject);" from PIE root *leg- (1) "to collect, gather," with derivatives meaning "to speak (to 'pick out words')." Often via Medieval Latin -logia, French -logie. In philology "love of learning; love of words or discourse," apology, doxology, analogy, trilogy, etc., Greek logos "word, speech, statement, discourse" is directly concerned.