The Collaborative International Dictionary
Orchidology
Orchidology \Or`chid*ol"o*gy\, n. [Gr. ? the orchis + -logy.] The branch of botany which treats of orchids.
Wiktionary
orchidology
n. The study of orchids.
Wikipedia
Orchidology
The orchidology is the scientific study of orchids. It is an organismal-level branch of botany.