The Collaborative International Dictionary of English v.0.48:
cytotaxonomy \cy`to*tax*on"o*my\ (s[imac]`t[-o]*t[a^]ks*[o^]n"[-o]*m[y^]), n. (Biology) A branch of taxonomy which uses the characteristics of cellular structures, such as somatic chromosomes, to classify organisms. [PJC] -- cy`to*tax*on"o*mist, n. -- cy`to*tax`o*nom"ic, a. -- cy`to*tax`o*nom"ic*al*ly, adv. [PJC]