Relating to or characterized by a lack of septa (dividing walls or partitions), often used in anatomy or botany.
From Latin 'a-' (without) + 'septum' (wall or partition) + '-al' (relating to). Septa are structural divisions in organisms, so aliseptal means without such divisions.
Some organisms evolved without internal walls dividing their bodies—aliseptal structures tell us that compartmentalization isn't always evolution's answer, and some creatures thrive just fine as open systems.
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