(geographical) The northern province of Ireland, made up of all six Northern Irish counties and three counties in the Republic of Ireland.

Alternative letter-case form of ulster (“men's heavy overcoat”)

A large body of prose and verse centering around the traditional heroes of Ulaid and the reign of Conchobar mac Nessa. One of the four major cycles of Irish Mythology.

Extremely conservative, especially in politics.

A person or group with extremely conservative views.

(acoustics) Beyond (higher in frequency than) the range of sound perceptible to the human ear; with a frequency of 20 kilohertz or higher.

of electromagnetic radiation beyond (higher in frequency than) light visible to the human eye; radiation with wavelengths from 380 nanometre - 10 nanometre

Ultraviolet colour.

(uncountable) Light in the ultraviolet part of the spectrum. / (countable) A light bulb that emits ultraviolet light; a black light.

A people of Early Ireland who gave their name to the Irish province of Ulster. / (historical) the former kingdom of northern Ireland belonging to the ancestors of the Ulstermen