diff --git a/kjvstudy_org/jinja_filters.py b/kjvstudy_org/jinja_filters.py
index f779963..7f871ec 100644
--- a/kjvstudy_org/jinja_filters.py
+++ b/kjvstudy_org/jinja_filters.py
@@ -160,7 +160,7 @@ def inject_word_markers(text, word_studies, verse_num):
         # Link the original term to Strong's page if we have a Strong's number
         strongs = study.get('strongs')
         if strongs:
-            term_html = f'<a href="/strongs/{strongs}">{study["term"]}</a>'
+            term_html = f'<a href="/strongs/{strongs}" class="strongs-link" data-strongs="{strongs}">{study["term"]}</a>'
         else:
             term_html = study["term"]
         # Wrap details (translit + note) in a span that's hidden by default
diff --git a/kjvstudy_org/static/base.js b/kjvstudy_org/static/base.js
index 8640503..9a26cca 100644
--- a/kjvstudy_org/static/base.js
+++ b/kjvstudy_org/static/base.js
@@ -1619,6 +1619,113 @@ function showKeyboardHelp() {
   });
 })();
 
+// Strong's tooltip functionality
+(function() {
+  // Create tooltip element
+  var tooltip = document.createElement('div');
+  tooltip.className = 'strongs-tooltip';
+  document.body.appendChild(tooltip);
+
+  // Cache for fetched Strong's entries
+  var strongsCache = {};
+
+  // Fetch Strong's entry from API
+  async function fetchStrongsEntry(strongsNumber) {
+    if (strongsCache[strongsNumber]) {
+      return strongsCache[strongsNumber];
+    }
+
+    try {
+      var response = await fetch('/api/strongs/' + strongsNumber);
+      if (!response.ok) {
+        throw new Error('Not found');
+      }
+      var data = await response.json();
+      strongsCache[strongsNumber] = data;
+      return data;
+    } catch (e) {
+      return null;
+    }
+  }
+
+  // Show tooltip positioned relative to a link element
+  function showTooltip(data, linkElement) {
+    var isHebrew = data.strongs.startsWith('H');
+    var langClass = isHebrew ? 'hebrew' : 'greek';
+
+    tooltip.innerHTML =
+      '<div class="strongs-tooltip-word ' + langClass + '">' + data.word + '</div>' +
+      '<div class="strongs-tooltip-translit">' + data.transliteration + '</div>' +
+      '<div class="strongs-tooltip-number">' + data.strongs + '</div>' +
+      '<div class="strongs-tooltip-def">' + data.definition + '</div>';
+
+    // Position off-screen first to measure
+    tooltip.style.left = '-9999px';
+    tooltip.style.top = '-9999px';
+    tooltip.classList.add('show');
+
+    var tooltipWidth = tooltip.offsetWidth;
+    var tooltipHeight = tooltip.offsetHeight;
+
+    var linkRect = linkElement.getBoundingClientRect();
+    var padding = 10;
+
+    // Position below the link, centered
+    var x = linkRect.left + (linkRect.width / 2) - (tooltipWidth / 2);
+    var y = linkRect.bottom + 8 + window.scrollY;
+
+    // Keep within viewport
+    if (x + tooltipWidth > window.innerWidth - padding) {
+      x = window.innerWidth - tooltipWidth - padding;
+    }
+    if (x < padding) {
+      x = padding;
+    }
+    if (linkRect.bottom + 8 + tooltipHeight > window.innerHeight) {
+      y = linkRect.top - tooltipHeight - 8 + window.scrollY;
+    }
+    if (y < window.scrollY + padding) {
+      y = window.scrollY + padding;
+    }
+
+    tooltip.style.left = x + 'px';
+    tooltip.style.top = y + 'px';
+  }
+
+  function hideTooltip() {
+    tooltip.classList.remove('show');
+  }
+
+  // Event delegation for Strong's links
+  document.addEventListener('mouseover', function(e) {
+    var target = e.target;
+    if (!target.classList.contains('strongs-link')) return;
+
+    var strongsNumber = target.getAttribute('data-strongs');
+    if (!strongsNumber) return;
+
+    // Show loading state
+    tooltip.innerHTML = '<span style="color: var(--text-tertiary);">Loading...</span>';
+    var linkRect = target.getBoundingClientRect();
+    tooltip.style.left = linkRect.left + 'px';
+    tooltip.style.top = (linkRect.bottom + 8 + window.scrollY) + 'px';
+    tooltip.classList.add('show');
+
+    // Fetch and display
+    fetchStrongsEntry(strongsNumber).then(function(data) {
+      if (data && target.matches(':hover')) {
+        showTooltip(data, target);
+      } else if (!data) {
+        hideTooltip();
+      }
+    });
+
+    target.addEventListener('mouseleave', function() {
+      hideTooltip();
+    }, { once: true });
+  });
+})();
+
 // Site-wide verse linking
 (function() {
   function linkVerseReferences(element) {
diff --git a/kjvstudy_org/templates/base.html b/kjvstudy_org/templates/base.html
index 5136fdc..b7bd6de 100644
--- a/kjvstudy_org/templates/base.html
+++ b/kjvstudy_org/templates/base.html
@@ -301,6 +301,76 @@
             }
         }
 
+        /* Strong's tooltip styles */
+        .strongs-tooltip {
+            position: absolute;
+            background: var(--bg-color);
+            border: 1px solid var(--border-color-darker);
+            border-radius: 6px;
+            padding: 0.75rem 1rem;
+            min-width: 250px;
+            max-width: 350px;
+            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
+            z-index: 9999;
+            font-size: 0.95rem;
+            line-height: 1.5;
+            color: var(--text-color);
+            pointer-events: none;
+            opacity: 0;
+            transition: opacity 0.2s ease-in-out;
+        }
+
+        .strongs-tooltip.show {
+            opacity: 1;
+        }
+
+        .strongs-tooltip-word {
+            font-size: 1.4rem;
+            font-weight: 600;
+            margin-bottom: 0.25rem;
+        }
+
+        .strongs-tooltip-word.hebrew {
+            font-family: 'SBL Hebrew', 'Ezra SIL', 'Times New Roman', serif;
+            direction: rtl;
+        }
+
+        .strongs-tooltip-word.greek {
+            font-family: 'SBL Greek', 'Gentium Plus', 'Times New Roman', serif;
+        }
+
+        .strongs-tooltip-translit {
+            font-style: italic;
+            color: var(--text-secondary);
+            margin-bottom: 0.5rem;
+        }
+
+        .strongs-tooltip-number {
+            font-family: monospace;
+            font-size: 0.8rem;
+            color: var(--text-tertiary);
+            margin-bottom: 0.5rem;
+        }
+
+        .strongs-tooltip-def {
+            font-size: 0.9rem;
+            color: var(--text-color);
+        }
+
+        [data-theme="dark"] .strongs-tooltip {
+            background: #2a2a2a;
+            border-color: #444;
+            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
+        }
+
+        @media (prefers-color-scheme: dark) {
+            html:not([data-theme="light"]) .strongs-tooltip {
+                background: #2a2a2a;
+                border-color: #444;
+                box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
+            }
+        }
+
         /* Enhanced typography and spacing */
         body {
             counter-reset: sidenote-counter;