Mid 19th century; earliest use found in Quarterly Journal of Microscopical Science. From micro- + chemical noun. Compare microchemistry and earlier microchemically.
Definition of microchemical in US English:
microchemical
adjectiveˌmʌɪkrə(ʊ)ˈkɛmɪkl
Of, relating to, or utilizing microchemistry.
Origin
Mid 19th century; earliest use found in Quarterly Journal of Microscopical Science. From micro- + chemical [noun]. Compare microchemistry and earlier microchemically.