orismology

noun

or·​is·​mol·​o·​gy ˌȯr-əz-ˈmä-lə-jē 

ˌär-

: the science of defining technical terms

orismological

ˌȯr-əz-mə-ˈlä-ji-kəl 

ˌär-;

ȯ-ˌriz-

adjective

Word History

Etymology

Greek horismos definition (from horizein to define) + English -logy — more at horizon

First Known Use

1815, in the meaning defined above