noun pl. septums -·tums or septa -·ta (-tə)
Biol. a thin wall, membrane, etc. that separates two cavities or two masses of tissue, as in the nose or in a fruit
Etymology:
ModL < L, enclosure, hedge < saepire, to enclose, fence < saepes, a hedge < IE base *saip-, hedge fence > Gr haimos, thicket
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