| Analgesic | 1) causing analgesia or freedom from pain. 2) a pain relieving remedy. |
| Analog | Compound with similar electronic structure but different atoms. |
| Controlled Substances |
Those drug substances which are listed as of January 1, 1988 under schedules I through V of the United States Title 21 Code of Federal Regulations (CFR) section 1300 to end. |
| Derivative | An organic compound containing a structural radical similar to that from which it is derived, for example, benzene derivatives containing the benzene ring. |
| Homolog | Member of a series of compounds whose structure differs regularly by some radical, for example, methylene, from that of its adjacent neighbors in the series. |
| Schedule I | Schedule I is a listing of those substances which are controlled under U. S. federal laws, are deemed to have a high potential for abuse, and for which there is no accepted medical use. |
| Schedule II | Schedule II is a listing of those substances which are controlled under U. S. federal laws, are deemed to have a high potential for abuse, and for which there is a accepted medical use. |