ulcer

noun

(a kind of sore that does not heal easily, on the skin or inside the body: a mouth/stomach ulcer.)

ultimate

adjective

(last or final.)

- ultimately

ultimately

adverb (in the end: We hope ultimately to be able to buy a house of our own.)

ultimatum

plural - ultimatums; noun

(a final demand made by one person, nation etc to another, with a threat to stop peaceful discussion and declare war etc if the demand is ignored: An ultimatum has been issued to him to withdraw his troops from our territory.)

ultimatums

plural; see ultimatum

ultra-

1) (beyond, as in ultraviolet.)

2) (very or excessively: He's ultra-cautious when he drives a car.)

ultrasonic

adjective

((of sound waves etc) beyond the range of human hearing: ultrasonic vibrations.)

ultrasound

noun

(ultrasonic sound, used especially in scanners, that can show what is inside a person's body.)

ultraviolet

adjective

((of light) consisting of rays from the invisible part of the spectrum beyond the purple, that have an effect on the skin, eg causing suntan.)