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ABO system a classification system for the inherited antigens found on the surface of human red blood cells, which determine compatibility for blood transfusions.
blood typing the classification of blood samples according to blood group, esp. to determine compatibility of donors with recipients of transfusions or transplants.
botany the branch of biological science that deals with the classification and study of plants. [1/4 definitions]
bracket a classification or grouping of people who share some characteristic such as age or amount of income. [1/7 definitions]
category a specific class or group in a classification system.
decimal system decimal classification. [1/2 definitions]
declassify to remove the security classification, such as "top secret," from (an official document, information, or the like).
degree in law, a classification of a crime based on its seriousness. [1/6 definitions]
descriptive characterized by classification and description rather than by explanation or interpretation, esp. in reference to fields of study. [1/2 definitions]
diagnosis in biology, an exact description leading to a classification. [1/4 definitions]
discography the classification or study of phonograph records. [1/2 definitions]
equivocal of unknown or uncertain significance or classification. [1/3 definitions]
ethnic pertaining to the origin or classification of groups according to criteria such as culture, race, religion, nationality, or language. [1/3 definitions]
Gram's method a method of classifying bacteria by staining them with a violet dye, the retention or loss of which determines their classification.
lithology the character of a rock or rock formation, determined by its structure, composition, and classification. [1/2 definitions]
monotype in biology, a single species that is the unique representative of its gender, family, or higher taxonomic classification.
monotypic of a biological species, being the unique representative of one's gender, family, or higher taxonomic classification.
overclassification combined form of classification.
petrography the scientific description and classification of rocks.
petrology the scientific study and classification of rocks.
phonetics (used with a sing. verb) the study of the production, perception, transcription, and classification of speech sounds.