Relating to or inhabiting trees; tree-dwelling or tree-related.
From Latin arbor (tree) + -ical (suffix forming adjectives). The -ical suffix comes through French and represents an intensified or more formal version of -ic.
This word is less common than 'arboreal,' but both describe tree-related things—'arborical' tends to appear in more technical or scientific writing, showing how English often maintains multiple formal registers for the same concept.
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