(video games) A level in a computer game that is impossible to win, usually due to programming errors.

(uncountable) The state or quality of being derived; derivativity. / (countable) A derived characteristic; a derivation.

(organic chemistry) Any halohydrin in which the halogen is fluorine.

(psychology) The tendency for students to rate a teacher highly if lectures are presented in a very expressive, humorous, and warm manner, even when the content of the lecture is meaningless and in...