də̇ˈsepəmənt noun
Etymology: Latin dissaepimentum partition, from dissaepire, dissepire to separate, divide (from dis- apart + saepire, sepire to fence in) + -mentum -ment — more at dis- , sepiment
: a separating tissue : partition: as
a. : septum
b. : trama
c. : one of the transverse calcareous partitions between the radiating septa of a coral
d. : a crossbar between branches of a lace bryozoan colony
e. : a similar support of a graptolite