Of, relating to, or characteristic of an essay or the style of essay writing.
From essay plus the adjective suffix -ical. A rare English formation meaning 'essay-like' or 'in the manner of essays.'
The word 'essayical' is delightfully awkward—people almost never use it, preferring simpler words like 'essay-like,' which shows how English avoids making -ical words when shorter options exist!
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