-ology, -logy, -ologist, -logist

(Greek: a suffix meaning: to talk, to speak; a branch of knowledge; any science or academic field that ends in -ology which is a variant of -logy; a person who speaks in a certain manner; someone who deals with certain topics or subjects)

The word -ology is a back-formation from the names of certain disciplines. The -logy element basically means "the study of ____". Such words are formed from Greek or Latin roots with the terminal -logy derived from the Greek suffix -λογια (-logia), speaking, from λεγειν (legein), "to speak".

The suffix -ology is considered to be misleading sometimes as when the "o" is actually part of the word stem that receives the -logy ending; such as, bio + logy.

Through the years -ology and -logy have come to mean, "study of" or "science of" and either of these suffixes often utilize the form of -ologist, "one who (whatever the preceding element refers to)".

The examples shown in this unit represent just a small fraction of the many words that exist in various dictionaries.

pedology
1. Study of the structure and formation of soils; soil science.
2. The scientific study of soils, including their origins, characteristics, and classifications.
pedology, paidology (s) (noun); pedologyies, paidologies (pl)
1. The study of the nature of children.
2. A rarely used term for the branch of biology and of sociology concerned with the child in his or her physical, mental, and social development.
3. In psychiatry, infantile or childish speech that omits all but the principal words and substitutes easily pronounced sounds for more difficult ones; baby talk.
pedonosology, paedonosology (s) (noun); pedonosologies, paedonosologies (pl)
The study of the diseases of children.
pegologist
pegology
pelology
1. The study of mud and its therapeutic applications.
2. The study of mud and similar substances.
pelycology
The study of the pelvis, particularly in relation to pregnancy and labor during delivery of the fetus.
penologist
Someone who studies the theory and practice of prison management.
penology, poenology
The study, theory, and practice of prison management and criminal rehabilitation.

Penitentiary science which is concerned with the processes devised and adopted for the punishment, repression, and prevention of crime, and the treatment of prisoners.

perinatologist
1. An obstetrician specializing in perinatology.
2. An obstetrical subspecialist concerned with the care of the mother and fetus at higher-than-normal risk for complications.

A perinatologist logically could be an obstetrician or pediatrician but, in practice, a perinatologist is an obstetrician.

The comparable area of pediatrics is neonatology. A high-risk baby might be cared for by a perinatologist before birth and by a neonatologist after birth.

perinatology
A subspecialty of obstetrics concerned with the care of the mother and fetus at higher-than-normal risk for complications.

Since the perinatal period, depending on the definition, starts at the 20th to 28th week of gestation and ends one to four weeks after birth, perinatology logically could be an obstetrical and pediatric subspecialty but, in practice, it is part of obstetrics.

The comparable area of pediatrics is neonatology. A high-risk baby might be cared for by a perinatologist before birth and by a neonatologist after birth.

The word perinatology is a linguistic combination of the Greek peri-, "around" or "about" plus natal from the Latin natus, "born" plus ology from the Greek logos, "treatise" or "study of".

periodontology
The branch of dentistry that deals with the scientific study of the structures and functions of the periodontium in health and disease; broader in scope than periodontics, which is limited to the diagnosis, prevention, and treatment of periodontal disease, although the two terms are sometimes used interchangeably.
perissology (s) (noun), perissologies (pl)
1. The use of more words than are necessary to give meaning or understanding about what is being said; pleonasm: When Greg's mother asked the plumber what went wrong with the water not coming out from the faucets, his perissology confused her so much that she had no idea what he was talking about.
2. Etymology: from Greek, perissologos and from Latin perissologia, "speaking too much".
Verbosity of talking.
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pestology
The study of pests.
petrologist (s) (noun), petrologists (pl)
A person who is a specialist in the field of large and small boulders: A famous petrologist was invited to be a guest speaker at Calvin's university and to give a talk about the composition and texture of igneous matter; such as, slate, marble, granite, and schist or fine-grained sandstone, etc.
Cross references of word families related directly, or indirectly, to: "talk, speak, speech; words, language; tongue, etc.": cit-; clam-; dic-; fa-; -farious; glosso-; glotto-; lalo-; linguo-; locu-; logo-; loqu-; mythico-; ora-; -phasia; -phemia; phon-; phras-; Quotes: Language,Part 1; Quotes: Language, Part 2; Quotes: Language, Part 3; serm-; tongue; voc-.