MONOSITHO (az mono… va yun. kytos — zarf, dar in jo hujayra), yake az shaklhoi hujayrahoi safedi bedonai khun — agranulitho. Monositho dar magzi ustukhon ba vujud meoyand; odatan yadroi lubiyoshakl va sitoplazmai sustbazofili dorand. Dar khuni mutadili odam 4—8%-i leykositro tashkil medihand. Andozai Monositho 12—20 mkm ast. Monositho qobiliyati fagositoza dorand va az khun ba bofta guzashta ba makrofagho tabdil meyoband.