nounpl. -·tums or -·ta
Biol. a thin wall, membrane, etc. that separates two cavities or two masses of tissue, as in the nose or in a fruit
Origin of septumModern Latin from L, enclosure, hedge from saepire, to enclose, fence from saepes, a hedge from Indo-European base an unverified form saip-, hedge fence from source Classical Greek haimos, thicket
A thin partition or membrane that divides two cavities or soft masses of tissue in an organism: the nasal septum; the atrial septum of the heart.
Origin of septumNew Latin sēptum from Latin saeptum partition from neuter past participle of saepīre to enclose from saepēs fence
(plural septa or septums)
- (anatomy) A wall separating two cavities; a partition; as, the nasal septum.
- (botany) A partition that separates the cells of a fruit.
- (mycology) A partition that separates the cells of a (septated) fungus.
- (zoology) One of the radial calcareous plates of a coral.
- (zoology) One of the transverse partitions dividing the shell of a mollusk, or of a rhizopod, into several chambers.
- (zoology) One of the transverse partitions dividing the body cavity of an annelid.