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In biology, trinomial nomenclature refers to names for taxa below the rank of species. This is different for animals and plants:

• for animals see trinomen. There is only one rank allowed below the rank of species: subspecies.
• for plants see ternary name. There is an indeterminate number of infraspecific ranks allowed below the level of species: subspecies is the highest ranked of these.

[edit] Word origin

Latin. Literally meaning a three-name naming system.

[edit] See also

• Binomial nomenclature