A type of fruit that splits into two one-seeded portions, as seen in carrot and parsnip plants.
From 'dia-' (two) + 'achaenium' (a type of single-seeded fruit), a specialized botanical term for binary fruits.
Diachaenium explains why carrot seeds look so weird and bumpy—what you see is actually two joined fruits splitting apart, and each bump helps the seed stick to animal fur for dispersal.
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