1. Mediterranean annual or biennial herb having pinkish to purple flowers surrounded by spine-tipped scales; naturalized in America
   - star-thistle, caltrop

Type of: centaury

• ululate
• ululation
• Ulva
• Ulvaceae
• Ulvales
• Ulvophyceae
• Ulysses
• Ulysses Grant
• Ulysses S. Grant
• Ulysses Simpson Grant
• um
• Uma
• Uma notata
• umami
• Umar al-Mukhtar Forces
• Umayyad
• white wine
• white wolf
• white woman
• white wood aster
• white yam
• white zinnia
• white-alder family
• white-bellied swallow
• white-berry yew