Assyriology (n.)

Middle English, from Latin Assyria, from Greek Assyria, short for Assyria ge "the Assyrian land," from fem. of Assyrios "pertaining to Assyria," from Akkadian Ashshur, name of the chief city of the kingdom and also of a god, probably from Assyrian sar "prince." Compare Syria. Related: Assyrian.

word-forming element indicating "branch of knowledge, science," now the usual form of -logy. Originally used c. 1800 in nonce formations (commonsensology, etc.), it gained legitimacy by influence of the proper formation in geology, mythology, etc., where the -o- is a stem vowel in the previous element.

The second element is prop[erly] -logy (-logue, etc.), the -o- belonging to the preceding element; but the accent makes the apparent element in E[nglish] to be -ology, which is hence often used as an independent word. [Century Dictionary]