1. Significant; ominous; serving as a warning of danger; - applied esp. to the warning colours or forms of certain animals

Encyclopedia: Sematic

• sixth form
• sixth sense
• sixth-former
• sixthly
• sixties
• sixtieth
• Sixtus IV
• sixty
• sixty-eight
• sixty-fifth
• sixty-five
• sixty-four
• sixty-fourth
• sixty-fourth note
• sixty-nine
• sixty-one
• sixty-seven
• sixty-six
• sixty-three
• sixty-two
• sizable
• sizar
• size
• size constancy
• size of it