dissepiment

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dis·sep·i·ment

(di-sep'i-ment),
A separating tissue, partition, or septum.
[L. dis- sepio, pp. -septus, to divide by a fence]

dissepiment

(dĭ-sĕp′ə-mənt)
n.
Biology A partition dividing a part or organ; a septum.

dis·sep′i·men′tal (-mĕn′tl) adj.