IPA: /nəʊˈmɛnklətʃərəl/
KK: /noʊˈmɛnkləˌtʃʊrəl/
Relating to the system of names used in a particular field, especially in science.
The nomenclatural rules for naming species are very strict.
Nomenclatural → It is formed from "nomen" (meaning name) and "clatura" (from "clatus", meaning to call or to name). The word refers to the system or act of naming things, particularly in a scientific context.
Think of 'nomen' meaning name and 'clatura' relating to calling — this helps you remember that nomenclatural refers to the system of naming.