Eureka (word)
The exclamation 'Eureka!' is attributed to the ancient Greek scholar Archimedes. He reportedly proclaimed "Eureka! Eureka!" after he had stepped into a bath and noticed that the water level rose, whereupon he suddenly understood that the volume of water displaced must be equal to the volume of the part of his body he had submerged. (This relation is "not" what is known as Archimedes' principle—that deals with the "upthrust" experienced by a body immersed in a fluid.) He then realized that the volume of irregular objects could be measured with precision, a previously intractable problem. He is said to have been so eager to share his discovery that he leapt out of his bathtub and ran naked through the streets of Syracuse.
Eulgem
Werner Schumacher offers several possible derivations for the distinguishing prefix, but none is certain. It could be from the Latin for elm, or perhaps from "Olk" or "Ulca", meaning “land that can be worked by plough” or “land that is worked”. Schumacher also cites a Dr. Beestermöller who believes that the root may be a Celtic reference to wetlands.