Having a tube-like or pipe-like shape; shaped like or resembling a fistula or elongated narrow passage.
From Latin fistula (tube) + -form (shaped like). This combines to literally mean 'tube-shaped,' used in botany and zoology to describe shapes.
Plant scientists use 'fistuliform' to describe certain grass stems and fungal structures—nature loves the tube shape because it provides maximum strength with minimal material, which is why it shows up in animals, plants, and why engineers use pipes for buildings.
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