-logy

"-logy" is a combining form word (a word that is used, or used with a particular meaning, only when joined to another word).
Possible definitions include:
* a combining form used to indicate the science or study of, or to refer to bodies of knowledge; musicology; paleontology; theology.
* a combining form used to indicate writing, discourse, or body of writings; trilogy; phraseology; martyrology.
== Origin ==
From Latin -logia, from Greek, from the word logos.