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arthritis
Science; General science
A group of diseases affecting joints or their component tissues. Several types of arthritis are recognized, and these can be divided into groups by their clinical course and ...
operon
Science; General science
A group of distinct genes that are expressed and regulated as a unit. Each operon is a DNA sequence that is composed of a tightly linked cluster of genes. At the 5′ end of the ...
anxiety disorders
Science; General science
A group of distinct psychiatric disorders (including generalized anxiety disorder, panic disorder, obsessive-compulsive disorder, social anxiety disorder, and posttraumatic stress ...
barbiturates
Science; General science
A group of drugs widely used for the suppression of anxiety, the induction of sleep, and the control of seizures. Some of them, when injected intravenously, produce a general ...
aspidogastrea
Science; General science
A group of entoparasites considered to be a subclass or order of the Trematoda. They have strongly developed ventral holdfasts whose alveolations are taxonomically important. ...
protozoa
Science; General science
A group of eukaryotic microorganisms traditionally classified as one of the five animal kingdoms. Although the name signifies primitive animals, some protozoa (phytoflagellates ...
ichthyornithiformes
Science; General science
A group of extinct flying birds known exclusively from the latest stages of the Cretaceous (80–65 million years ago) in North America. Along with Hesperornithiformes, ...
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