Leucocythaemia \Leu`co*cy*th[ae]"mi*a\ Leucocythemia \Leu`co*cy*the"mi*a\ ](l[=u]`k[-o]*s[-i]*th[=e]"m[i^]*[.a]), n. [NL., fr. Gr. leyko`s white + ky`tos a hollow vessel + a"i^ma blood.] (Med.) Same as {leukemia}. [1913 Webster]