Definition of dissepiment in US English:

dissepiment

noun

Zoology Botany
  • A partition in a part or organ; a septum.

    • ‘During this time small horizontal internal blister-like plates called dissepiments appeared in several lineages.’
    • ‘It has dissepiments, but only a few large presepiments, so that most major septa are uninterrupted.’
    • ‘On the contrary, in calicular sections, several flat dissepiments are intermittently developed directly below the epitheca.’
    • ‘Additionally, in the Kendrick corals dolomitic crusts are common on the exteriors of septal flanks and dissepiment surfaces within interseptal spaces.’
    • ‘A distinctive character of adult corallites of Macgeea dubia is the tendency to develop numerous herringbone dissepiments, which is increased by the fact that minor septa are commonly reduced.’

Origin

Early 18th century: from Latin dissaepimentum, from dissaepire ‘make separate’, from dis- (expressing separation) + saepire ‘divide by a hedge’.

Pronunciation

dissepiment

/dəˈsepəmənt/