A condition caused by methylmercury poisoning, characterised by paresthesia, ataxia, and impaired speech and vision.

plural of Hertzsprung-Russell diagram

A type of small dog, usually brown and white in colour, often used by farmers for rodent control.

(astronomy) A graphic representation of the absolute magnitude of stars against their color (or surface temperature), which shows the main sequence of stars plus the white dwarfs and red giants.

plural of Jack Russell terrier

The time measurement resulting from an in vitro diagnostic test based on the ability of the venom of the Russell's viper to induce thrombosis.