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+(require 'cl-macs)
+(require 'ht)
+(require 'seq)
+(require 's)
+
+;; Type definitions for Russian structures
+
+(cl-defstruct russian-word
+  "Definition and metadata of a single Russian word."
+  (word nil :type string)
+  (translations :type list
+                :documentation "List of lists of strings, each a set of translations.")
+
+  (notes nil :type list ;; of string
+         :documentation "free-form notes about this word")
+
+  (roots nil :type list ;; of string
+         :documentation "list of strings that correspond with roots (exact string match)"))
+
+(defun russian--merge-words (previous new)
+  "Merge two Russian word definitions together. If no previous
+  definition exists, only the new one will be returned."
+  (if (not previous) new
+    (assert (equal (russian-word-word previous)
+                   (russian-word-word new))
+            "different words passed into merge function")
+    (make-russian-word :word (russian-word-word previous)
+                       :translations (-concat (russian-word-translations previous)
+                                              (russian-word-translations new))
+                       :notes (-concat (russian-word-notes previous)
+                                       (russian-word-notes new))
+                       :roots (-concat (russian-word-roots previous)
+                                       (russian-word-roots new)))))
+
+;; Definitions for creating a data structure of all Russian words.
+
+(defvar russian-words (make-hash-table)
+  "Table of all Russian words in the corpus.")
+
+(defun russian--define-word (word)
+  "Define a single word in the corpus, optionally merging it with
+  another entry."
+  (let ((key (russian-word-word word)))
+    (ht-set russian-words key (russian--merge-words
+                               (ht-get russian-words key)
+                               word))))
+
+(defmacro define-russian-words (&rest words)
+  "Define the list of all available words. There may be more than
+  one entry for a word in some cases."
+  (declare (indent defun))
+
+  ;; Clear the table before proceeding with insertion
+  (setq russian-words (make-hash-table))
+
+  (seq-map
+   (lambda (word)
+     (russian--define-word (make-russian-word :word (car word)
+                                              :translations (cadr word)
+                                              :notes (caddr word)
+                                              :roots (cadddr word))))
+   words)
+
+  '(message "Defined %s unique words." (ht-size russian-words)))
+
+;; Helpers to train Russian words through passively.
+
+(defun russian--format-word (word)
+  "Format a Russian word suitable for echo display."
+  (apply #'s-concat
+         (-flatten
+          (list (russian-word-word word)
+                " - "
+                (s-join ", " (russian-word-translations word))
+                (when-let ((roots (russian-word-roots word)))
+                  (list " [" (s-join ", " roots) "]"))
+                (when-let ((notes (russian-word-notes word)))
+                  (list " (" (s-join "; " notes) ")"))))))
+
+(defun display-russian-words ()
+  "Convert Russian words to passively terms and start passively."
+  (interactive)
+  (setq passively-learn-terms (make-hash-table))
+  (ht-map
+   (lambda (k v)
+     (ht-set passively-learn-terms k (russian--format-word v)))
+   russian-words)
+  (passively-enable))
+
+(defun lookup-last-russian-word (in-eww)
+  "Look up the last Russian word in Wiktionary"
+  (interactive "P")
+  (let ((url (concat "https://ru.wiktionary.org/wiki/" passively-last-displayed)))
+    (if in-eww (eww url)
+      (browse-url url))))
+
+(provide 'russian)