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Substantiivit

1. A state of sleep from which one may not wake up, usually induced by some form of trauma.
2. (astronomy) A cloud of dust surrounding the nucleus of a comet.
3. (optics) A defect characterized by diffuse, pear-shaped images that should be points.
4. (botany) A tuft or bunch, such as the assemblage of branches forming the head of a tree, a cluster of bracts when empty and terminating the inflorescence of a plant, or a tuft of long hairs on certain seeds.