valedictorian: the student with the best grades who usually delivers the valedictory address at commencement
scholar: a learned person (especially in the humanities); someone who by long study has gained mastery in one or more disciplines
angioedema: recurrent large circumscribed areas of subcutaneous edema; onset is sudden and it disappears within 24 hours; seen mainly in young women, often as an allergic reaction to food or drugs