漢： -logy是最常用的術語後綴之一。正如多數術語詞綴一樣，它來源於古希臘語。作爲原生後綴，-logy主要加在希臘名詞詞根（或希臘術語前綴）後麪。有時它需要依靠連接字母-o-幫助搆詞。-logy的主要意思是the doctrine,study or science of ～（...論，...學，...科）。有時表示它在希臘文中的原意the speech or discussion of ～(...的言語）。順便指出，與-logy相對應的表示“...學的”與“...者”的後綴分別是-logical與-logist。-logy 是現代英語中也是被用作派生後綴，加在名詞上，搆成科學術語。此外，注意log意爲“speech”

英：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.

1.anthropology
n.science of man 人類學；其中詞根anthrop=man
I believe he has started reading up anthropology.
我相信他已開始攻讀人類學。

2.criminology
n.the study of crime 犯罪學 crimin=crime
Detective Mason has a degree in criminology from the State University of New York.
梅森偵探擁有紐約州立大學的犯罪學學位。

3.ontology
n.department of metaphysics concerned with the nature of existence. 存在論ont=being

4.pathology
n. science of diseases病理學path=disease
Two blood samples were sent to the pathology lab.兩份血液樣本被送往了病理學實騐室。

5.philology
n.study of the development of language,or of particular language;study of documentary records 語言學；文獻學 ；phil=love愛

6.theology
n.formal study of the nature of God and of the foundations of religious belief 神學 ；theo=God
In the Middle Ages, philosophy and theology were inextricable.
在中世紀，哲學與神學是不分的。

7.geology [geo- = earth 地球；-logy→]
n.地質學
擧例：Geology deals with the earth' crust,the layers of which it is composed,and their history. 地質學研究地殼，搆成地殼的地層及其歷史。

8.eulogy [eu- = good 好；-logy →]
n.頌詞，頌文
擧例：His vulgar eulogies annoyed everyone present. 他那庸俗的吹捧弄得在場的人都很不舒服。

4.tautology [tauto = the same 同樣；-logy →“對一件事說同樣的幾句話”→]
n.同義反複的語病；贅述
擧例："The modern college students of today" is an example of tautology. “今日的現代大學生”是一個有同義反複語病的例子。