What is meant by trinomial nomenclature?

Ans : Trinomial nomenclature refers to an extension of binomial nomenclature. In Trinomial nomenclature, the division of certain species takes place into smaller units based on finer variations. These smaller units in trinomial Nomenclature are known as subspecies or varieties. The writing of the name of the subspecies is after the specific epithet. Therefore, the name may take the form of a three-word name or a trinomial.