Definitions

1. noun

A type of three-name nomenclature, particularly in zoological taxonomy, where an organism is given three names, such as binomial nomenclature but with a third part.

“The new species was identified using a trionym, which included its genus, species, and subspecies.”

2. noun

A poetic or literary term for a trinity of names, often used in a metaphorical or figurative sense.

“The poem used a trionym to describe the three muses of art and literature.”