dreamagen.
/ˈdriːmɪdʒ/, U.S. /ˈdrimɪdʒ/ rare.
That which is dreamed or imagined; esp. delusion, false belief.
ΘΚΠ
the mind > mental capacity > perception or cognition > faculty of imagination > fancy or fantastic notion > [noun] > product of > vain imaginings
ventilation1684
dreamery1830
vapouring1866
dreamage1883
1883 Lippincott's Monthly Mag. Apr. 381/1 For all this, many Englishmen and Scotchmen, noticing that Americans are markedly partial to the word [sc. the verb ‘guess’], and resting at that datum, have dreamed dreams about it, and have committed their dreamage to paper.
1887 F. Hall in Nation (N.Y.) 16 June 515/3 The stamp of Mr. Moon's philology..may be seen from the musty dreamage which he retails concerning the origin of but, if, and though.
1914 H. Newbolt Aladore xlix. 310 He is a blasphemer of the faith, a dealer in dreamage and all manner of sorceries.
This entry has been updated (OED Third Edition, June 2014; most recently modified version published online March 2022).
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n.1883