Without pity or compassion; cruel, pitiless.

(chemistry) Containing ruthenium.

(baseball) Prodigiously accomplished with respect to batting, typically describing the flight of a long home run.

The property of being ruthless.

In a ruthless manner; with cruelty; without pity or compassion.

(US) A modern female given name.

An obsolete unit of radioactivity (symbol: rd), defined as the activity of a quantity of radioactive material in which one million nuclei decay per second.

A Scottish habitational surname from Old English from a place where there was once a settlement in the Scottish borders. / (rare) A male given name transferred from the surname.

The territory between Central and Eastern Europe inhabited by Rusyns, on the slopes of the Carpathian Mountains in parts of Ukraine, Poland and Slovakia.

(inorganic chemistry) The oxyanion of ruthenium RuO₄²⁻; any salt or mineral containing this anion, formally derived from ruthenic acid