The term 'hadst reference' can be synonyms with various other phrases that have similar meanings. One such phrase is 'had made mention,' which means to have referred to something previously. The phrase 'alluded to' can also be used as a synonym for 'hadst reference,' which suggests that something was indirectly referenced or hinted at. Additionally, 'made note of' can be used to describe the act of referring to something specific in a clear and concise manner. In essence, synonyms for 'hadst reference' imply that something was brought up or referred to in a previous conversation or context.