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log

Greek

Variants

loglogy

Related Roots

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About This Root

From Greek logos (word, speech, reason, study). Perhaps the most versatile Greek root in English. As a suffix -logy it names entire fields of knowledge: biology, psychology, archaeology, chronology. As a standalone it gives logic, dialogue, catalog, eulogy, analogy, and apology — all involving structured speech or reasoning.

Associated Words

analogous

Similar or comparable to something else in certain respects

TOEFLGREB2

analogy

A comparison highlighting similarity between two things, used for explanation

IELTSTOEFLGRE

anthropologist

An expert in the study of human beings and their societies

GREB2

apologetic

Expressing regret or apology; offering a defense of beliefs

IELTSC2

apology

An expression of regret for wronging someone; a formal defence of a belief

TOEFLB1

archaeological

Relating to archaeology

IELTSTOEFLB2

astrological

Relating to astrology or the study of celestial influence on human affairs

C2

biologic

Relating to biology or living organisms; a drug derived from living organisms

C2

biological

Relating to biology or living things; related by birth

NGSL 3kIELTSB2

biologically

In a biological manner; with regard to biology

C2

biologist

A scientist who studies living organisms

TOEFLB1

cardiologist

A doctor specializing in heart diseases

GREC2

catalog

A systematic list of items or products; to classify into a catalogue

NGSL 3kIELTSGRE

catalogue

A systematic list of items with descriptions; to list items systematically

IELTSB2

chronological

Arranged in the order in which events occurred

IELTSTOEFLB1

dermatologist

A doctor specializing in skin diseases

GREC2

dialog

A conversation between people; spoken lines in a story; to negotiate

NGSL 3kB1

dialogue

A conversation between people; spoken lines in drama or fiction

IELTSTOEFLB1

eclogue

A short pastoral poem about rural or shepherd life

GREC2

ecological

Relating to ecology or the natural environment

TOEFLB1

ecologist

A scientist who studies ecology

TOEFLGREB2

ecology

The study of relationships between organisms and their environment

IELTSTOEFLB1

embryological

Of or relating to embryology

TOEFLC2

epilogue

A closing section or speech at the end of a literary work or play

GREC2

etymology

The study of the origin and historical development of words

GREC2

eulogistic

Expressing high praise or admiration

GREC2

eulogize

To praise someone highly and eloquently, especially in a formal speech

GREC2

eulogy

A formal speech of praise, especially delivered at a funeral

TOEFLGREC2

genealogy

The study of family histories and lineages; a family tree

GREC2

herpetologist

A scientist who studies reptiles and amphibians

GREC2

log

A thick piece of cut wood; an official record of events; to cut down trees

NGSL 3kIELTSTOEFL

logic

The study of correct reasoning; a rational and sensible way of thinking

NGSL 3kIELTSTOEFL

logical

Based on clear, valid reasoning; reasonable and sensible

TOEFLA2

logistics

The planning and management of the supply and movement of goods or personnel

GREB1

meteorologist

A scientist who studies weather and atmospheric phenomena

TOEFLC2

microbiological

Relating to microbiology

C2

microbiologist

A scientist specializing in microbiology

C2

microbiology

The scientific study of microorganisms

IELTSC1

monologue

A long speech by one person in a play or conversation

IELTSGREC2

neologism

A newly coined word or phrase

GREC2

nonbiological

Not biological; not based on living matter or blood relation

C2

pathological

Relating to disease or mental disorder; compulsive and irrational

GREC1

philology

The scholarly study of historical languages and texts

TOEFLGREC2

physiological

Relating to the normal functions of living organisms

IELTSTOEFLGRE

physiology

The study of the functions and processes of living organisms

TOEFLB1

prologue

An introductory section at the beginning of a literary or dramatic work

IELTSGREB1

psychological

Relating to the mind, emotions, and behavior

NGSL 3kIELTSB1

psychologist

A specialist in the study or practice of psychology

TOEFLA2

psychology

The scientific study of the mind and behavior; mental characteristics

IELTSTOEFLGRE

rhapsody

An ecstatic expression of feeling; a free-form musical composition

GREC2

tautological

Involving needless repetition of the same meaning

GREC2

theological

Of or relating to theology

B1

trilogy

A set of three related literary, film, or dramatic works

TOEFLGREC2