1. (Science: enzyme) enzyme catalysing the hydrolysis of sucrose to glucose and fructose (sucrase), so called because the sugar solution changes from dextro rotatory to laevo rotatory during the course of the reaction.
2. Generally a name for an enzyme that catalyses certain molecular rearrangements. Dna invertases are a class of resolvase. An enzyme that catalyzes the hydrolysis of sucrose into glucose and fructose.