peaky or peakedadj (peakier, peakiest)

• ultrahigh frequency
• ultraism
• ultramarine
• ultramicroscope
• ultramicroscopic
• ultramodern
• ultramontane
• ultramundane
• ultrasonic
• ultrasonics
• ultrasound
• ultrastructure
• ultraviolet
• ultraviolet light
• ultra vires
• ululate
• umbel
• umbellifer
• umber
• umbilical
• umbilical cord
• umbilicate
• umbilicus
• umbles
• umbo