The definition for iridescent is "Having a lustrous or attractivve quality." Used in a sentence: The movie star's iridescent presence charmed even the hardened reporter. The definition for avian is "relating to birds.", the definition for polarize is "To break up into opposing groups.", and the definition for straddle is "To favor opposing sides."

The definition for combustion is "Act of burning." Used in a sentence: Campers must use fire with great caution to prevent combustion of the parched brush. The definition for distortion is "the act of twisting out of shape.", the definition for eloquent is "Fluent, expressive.", and the definition for flaw is "An imperfection."

The definition for raucous is "Noisy, rowdy." Used in a sentence: Serena, who preferred quiet conversation, left the rancous party. The definition for duplicity is "deceptive thought, speech, or action.", the definition for interminable is "Never ending, or seemingly endless.", and the definition for ethical is "Conforming to accepted standards."

The definition for buffer is "Protective barrier." Used in a sentence: The dense trees acted as a buffer against the heavy rain. The definition for interminable is "never ending, or seemingly endless.", the definition for compulsion is "An irresistible impulse.", and the definition for catastrophic is "Relating to extreme misfortune."

The definition for pretentious is "Making unjustified claims." Used in a sentence: The pretentious boy said that he was the fastest runner, but he finished last in the race. The definition for penurious is "extrememly stingy.", the definition for disdain is "Feeling of contempt.", and the definition for recrimination is "A retaliatory accusation."