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infinitesimal (adj) extremely small.
An Infinitesimal thing is a very small thing. An infinitesimal being is an extremely small being. An Infinitesimal increase is an extremely small increase and can be ignored. An infinitesimal movement is too small a movement to be quickly noticed.
- In comparison with the size of the universe, the earth must appear infinitesimal. Even in comparison with the sun it looks very small, and there are a number of stars much larger than the sun.
- The forensic experts were able to find traces of poison, though infinitesimal, in the drink that the man had taken before his death. The poison even in such small dose proved fatal.