| Word | Definitions | Synonyms |
|---|---|---|
| nacre | (noun) the iridescent internal layer of a mollusk shell | Synonyms: mother-of-pearl |
| quinacrine | (noun) a drug (trade name Atabrine) used to treat certain worm infestations and once used to treat malaria | Synonyms: Atabrine, mepacrine, quinacrine hydrochloride |