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binomial (adjective), more binomial, most binomial
1. A reference to two terms; a mathematical expression is made up of two terms and a plus or minus sign.
2. In biology, relating to a pair of Latin or Latinized words forming a scientific name in the classification of plants, animals, and microorganisms. The first word represents the genus and the second the species.

Man, Animals, and Scientific Investigations

From the earliest times, animals have been vitally important to man; cave art demonstrates the practical and mystical significance animals held for prehistoric man. Early efforts to classify animals were based on physical resemblance, habitat, or economic use.

Although Hippocrates and Aristotle did much toward organizing the scientific thought of their times, systematic investigation declined under the Romans and, after Galen's notable contributions, came to a virtual halt lasting through the Middle Ages (except among the Arab physicians).

With the Renaissance, a direct observation of nature was revived; landmarks were Vesalius' anatomy and Harvey's demonstration of the circulation of blood.

The invention of the microscope and the use of experimental techniques expanded zoology as a field and established many of its branches; such as, cytology and histology. Studies in embryology and morphology also revealed much about the nature of growth and the biological relationships of animals.

The system of binomial nomenclature was devised to indicate these relationships; Linnaeus was the first to make it consistent and apply it systematically.

Paleontology, the study of fossil organisms, was founded as a science by Cuvier about 1812.

Knowledge of physiological processes expanded greatly when physiology was integrated with the chemical and other physical sciences.

The establishment of the cell theory in 1839 and the acceptance of protoplasm as the stuff of life 30 years later gave impetus to the development of genetics.

Lamarck, Mendel, and Darwin presented concepts that revolutionized scientific thought. Their theories of evolution and of the physical basis of heredity prompted research into all life processes and into the relationships of all organisms.

The classic work of Pasteur and Koch opened up bacteriology as a field.

Modern zoology has not only concentrated on the cell, its parts and functions, and on expanding the knowledge of cytology, physiology, and biochemistry, but it has also explored such areas as psychology, anthropology, and ecology.

Binomial Nomenclature

The present system of binomial nomenclature identifies each species by a scientific name of two words, Latin in form and usually derived from Greek or Latin roots.

The first name (capitalized) is the genus of the organism, the second (not capitalized) is its species.

The advantages of scientific over common names are that they are accepted by speakers of all languages, that each name applies only to one species, and that each species has only one name.

This avoids the confusion that often arises from the use of a common name to designate different things in different places, or from the existence of several common names for a single species.

—Compiled from information located in the following sources:

"Binomial Nomenclature"; Encyclopaedia Britannica; Volume 3;
William Benton, Publisher; Chicago; 1968; page 661.

The Living World, 2nd edition, by George B. Johnson;
The McGraw-Hill Companies, Inc.; 2000; page 262.

Scientific American Science Desk Reference; John Wiley & Sons, Inc.;
New York; 1999; page 369.
This entry is located in the following units: bi-, bin-, bino-, bis- (page 7) nom-, nomen-, nomin-, -nomia, -nomic (page 1)