A pharmacist-reviewed dataset mapping 600 pieces of FDA drug-label and Structured Product Labeling (SPL) terminology to a single plain-English sentence each, the technical vocabulary a patient meets when reading prescribing information ("absolute neutrophil count", "hepatic impairment", "orthostatic hypotension", "titrate", "Abbreviated New Drug Application"). Each entry defines the term generically, never a specific product's dose or risk, so it can sit beside verbatim FDA label text as a just-in-time definition without altering that text. The glossary is the reference layer behind the label-definition tooltips on HelloPharmacist (https://hellopharmacist.com/ndc-lookup) drug and NDC pages. Entries were drafted and adversarially fact-checked through a domain-expert review workflow and follow fixed editorial rules (one sentence, general reading level, neutral, generic). The dataset is provided as CSV and JSON with an accompanying methodology report describing scope, term selection, definition principles, and limitations. Intended as a health-literacy / patient-education resource, it is not medical advice and contains no drug-specific, dose-specific, or risk information. Original first-party content, released under CC BY 4.0.