"omission of one occurrence of a sound or syllable that is repeated in a word," 1893; see haplo- + -logy.

"study of organic tissues," 1847, from histo- "tissue" + -logy. Related: Histological.

"the study of war," 1870, from Greek polemos "war," a word of unknown origin, + connective -o- + -logy.

"dispraise," the opposite of eulogy, 1837; see dys- + -logy. Related: Dyslogistic (1802). 

"branch of theology which studies the person and character of Jesus," 1670s, from Christ + connective -o- + -logy.

"branch of science which studies earthquakes and their causes and effects," 1852, from seismo- + -logy. Related: Seismological (1850).

"science of bodily humors," 1787, from French or German hygrologie, which are earlier, or from hygro- "wet, moist; moisture" + -logy.