merismatic

from The Century Dictionary.

• In biology, dividing by the formation of internal partitions; taking place by internal partition into cells or segments.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Biol.) Dividing into cells or segments; characterized by separation into two or more parts or sections by the formation of internal partitions.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective biology Dividing into cells or segments.