As a Noun: 1. LACTOSE INTOLERANCE means that a person cannot digest lactose, a type of sugar which is found in milk and which is sometimes added to food. 2. There appears to be no commonly used Auslan sign for LACTOSE INTOLERANCE. If you know a sign for LACTOSE INTOLERANCE used by you or other Auslan users (deaf people or interpreters) please go to "report missing sign" and supply details. Thank you.