diff --git a/src/deck/data.ts b/src/deck/data.ts
index 5dc328f..29439b6 100644
--- a/src/deck/data.ts
+++ b/src/deck/data.ts
@@ -556,6 +556,84 @@ export const brandCaseParts = (text: string) =>
     .filter(Boolean)
     .map((t, i) => ({ id: i, text: t, keep: t === 'SolLunar' }))
 
+/* ─────────────────────────────────────────────────────────────
+   Glossary — we keep the Bitcoin-native voice (this deck is for a
+   sovereignty-literate audience) but gloss the load-bearing jargon
+   inline: a dotted-underline term reveals a one-line definition and,
+   where useful, a "learn more" link so the reader can go deeper on
+   their own. Definitions live here; `glossedParts` splits any string
+   into plain text + term hits so `GlossedText` can render tooltips
+   without every slide rewriting its markup.
+   ───────────────────────────────────────────────────────────── */
+export type GlossaryEntry = {
+  term: string
+  short: string
+  more?: { label: string; href: string }
+}
+
+/** Keyed by the lowercased canonical term. */
+export const glossary: Record<string, GlossaryEntry> = {
+  stack: {
+    term: 'stack',
+    short:
+      'The shared hardware + software every location runs on — Lab 484’s open backbone.',
+  },
+  node: {
+    term: 'node',
+    short:
+      'One location running the full Lab 484 stack. SolLunar Austin is the first node.',
+  },
+  lightning: {
+    term: 'Lightning',
+    short:
+      'Bitcoin’s instant-settlement layer — tap-to-pay speed with tiny fees.',
+    more: { label: 'lightning.network', href: 'https://lightning.network' },
+  },
+  nostr: {
+    term: 'Nostr',
+    short:
+      'An open protocol for identity & messaging you own — no platform can revoke it.',
+    more: { label: 'nostr.com', href: 'https://nostr.how' },
+  },
+  cypherpunk: {
+    term: 'Cypherpunk',
+    short:
+      'Using cryptography to defend individual privacy and autonomy from centralized control.',
+    more: { label: 'what’s a cypherpunk?', href: 'https://en.wikipedia.org/wiki/Cypherpunk' },
+  },
+  mycelium: {
+    term: 'mycelium',
+    short:
+      'The underground fungal web that connects a forest — our metaphor for the shared backbone.',
+  },
+}
+
+/** Aliases that resolve to a canonical glossary key. */
+const glossaryAliases: Record<string, string> = { 'profit & loss': 'p&l' }
+
+// Longest-first so multi-word aliases win the alternation (e.g. "profit & loss").
+const glossaryPattern = [...Object.keys(glossary), ...Object.keys(glossaryAliases)]
+  .sort((a, b) => b.length - a.length)
+  .map((t) => t.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'))
+  .join('|')
+const glossaryRe = new RegExp(`(?<![A-Za-z0-9])(${glossaryPattern})(?![A-Za-z0-9])`, 'gi')
+
+export type GlossedPart = { id: number; text: string; entry?: GlossaryEntry }
+
+/**
+ * Split `text` into plain runs and glossary hits, so `GlossedText` can wrap the
+ * hits in a tooltip. Matching is case-insensitive and boundary-aware, so
+ * "node" won't fire inside "Noderunners".
+ */
+export const glossedParts = (text: string): GlossedPart[] =>
+  text
+    .split(glossaryRe)
+    .filter((t) => t !== '')
+    .map((t, id) => {
+      const key = glossaryAliases[t.toLowerCase()] ?? t.toLowerCase()
+      return { id, text: t, entry: glossary[key] }
+    })
+
 /** Tailwind class helpers keyed by entity accent — keeps slides declarative. */
 export const accentText: Record<Accent, string> = {
   pine: 'text-pine-300',