1. Having similar appearance but genetically different
   - isomorphic

See also: isomorphy

• ultraviolet spectrum
• Ulugh Muztagh
• ululant
• 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