Cuvette

• a small often transparent laboratory vessel (as a tube)
  (Source: Merriam-Webster Online Dictionary)
• laboratory vessel: a transparent tubular laboratory vessel or dish for holding a liquid
  (Source: Encarta® World English Dictionary)
• a container with specific dimensions (particularly thickness) and optical properties, used to examine colored or colorless solutions that are free of turbidity, as well as the light scattering of turbid suspensions, such as bacterial suspensions. Its efficacy depends on its chemical composition; e.g., one made of quartz is used for examination of materials in the ultraviolet region of the spectrum and one made of Pyrex is used for examination of materials in the visible range.
  (Source: Dorland's Illustrated Medical Dictionary)

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