Relating to insects or entomology; of or pertaining to the study of insects.
From entom- (insect) + -ical (adjectival suffix, from Latin -icalis). This is a fuller adjectival form compared to entomic, used more commonly in older scientific texts.
Entomical studies in the 1700s and 1800s literally mapped out insect anatomy and behavior in ways that prefigured modern biology—entomologists were the first to systematically catalogue thousands of species!
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