A castrated human male. / Such a man employed as harem guard or in certain (mainly Eastern) monarchies (e.g. late Roman and Chinese Empires) as court or state officials.

The river in the Middle East, 2780 kilometers in length, flowing southwest from Turkey, then southeast, and uniting with the Tigris before entering the Persian Gulf. It forms the Western edge of classical Mesopotamia.

Form of Euro- used before a vowel.

(geometry) The distance between two points defined as the square root of the sum of the squares of the differences between the corresponding coordinates of the points; for example, in two-dimensional Euclidean geometry, the Euclidean distance between two points a = (aₓ, a_y) and b = (bₓ, b_y) is defined as:

(linguistics, uncountable) The reconstructed ancestor language or protolanguage of the Indo-European family of languages, which includes most European, Iranian, and Indian languages.

(anthropology, countable) A person who spoke the Proto-Indo-European language.

(linguistics, anthropology) Of or pertaining to the Proto-Indo-European language, or the people who spoke it.

A valved brass instrument with conical tubing similar in appearance to a tuba but of higher pitch; a sax horn.

The human experience of feeling a sudden sense of insight upon making a discovery or realization.

(idiomatic) The moment of a sudden unexpected discovery.