crack-skulln.
rare.
= crack-brain n.
ΚΠ
1864 in Webster's Amer. Dict. Eng. Lang.
1889 E. Peacock Gloss. Words Manley & Corringham, Lincs. (ed. 2)
This entry has not yet been fully updated (first published 1893; most recently modified version published online June 2019).
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n.1864