Medical Dictionary


noun spe·cies \ˈspē-(ˌ)shēz, -(ˌ)sēz\
plural species

Medical Definition of SPECIES

a :  a category of biological classification ranking immediately below the genus or subgenus, comprising related organisms or populations potentially capable of interbreeding, and being designated by a binomial that consists of the name of the genus followed by a Latin or latinized uncapitalized noun or adjective agreeing grammatically with the genus name b :  an individual or kind belonging to a biological species
:  a particular kind of atomic nucleus, atom, molecule, or ion <production of DNA damage by active oxygen species>
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