Entry 1 sense Webster, 1913 hallucinogenic · hal·lu·ci·no·gen·ic · IPA /həˌlusɪnəˈd͡ʒɛnɪk/ 01 adj. capable of producing hallucinations; as, LSD is a powerful hallucinogenic drug. 1. capable of producing hallucinations; as, LSD is a powerful hallucinogenic drug.