Made of flitches; composed of bacon or pork slabs; having the qualities of flitched wood.
From 'flitch' with adjectival '-en' (Old English 'en'), an archaic suffix seen in words like 'wooden' and 'golden' that creates adjectives meaning 'made of' or 'resembling'.
The '-en' suffix (golden, wooden, leaden) comes from Old English and fell out of common use—now we prefer '-y' (gold→goldy isn't used, but wooden persists) or just use the noun directly, showing how some grammatical patterns fade while others strengthen.
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