whiz
n. countable B2 Upper Intermediate US //ˈhwɪz// UK //wˈɪz// whiz
n. a person who is very good at a specific skill or subject. You use this when someone is an expert at something like math or sports.
n. a person who is highly skilled or proficient in a particular field or activity.
He is a real whiz at fixing old cars.
After years of practice, she became a whiz at the piano and started teaching other students.
While the rest of the team struggled with the new software, he was already a whiz, having mastered the interface during his previous job.
Onomatopoeic. Compare huzz, hizz, hiss. In some noun senses perhaps derived from wizard.
See with.