What is the X in X-mas?
taxonomic tax·o·nom·ic (tāk'sə-nŏm'ĭk) or tax·o·nom·i·cal (-ĭ-kəl)
Of or relating to taxonomy.
taxonomy tax·on·o·my (tāk-sŏn'ə-mē)
The classification of organisms in an ordered system that indicates natural relationships.
The science, laws, or principles of classification; systematics.
The classification of living things. (See Linnean classification.)