Definition
The less substituted product (alkene) of an elimination reaction.
Explanation
When an unhindered base is used for an E2 elimination. This E2, however, has a twist. Unlike most E2 reactions, which form the most substituted double bond (the Zaitsev product) these ones end up always forming the least substituted double bond. It’s different because the Zaitsev is usually favored due to more substituted alkenes being more stable.