British spelling: to study insects or engage in the work of entomology; to conduct entomological research.
From entomology + -ise (British suffix for verbs, from Latin -izare). The British spelling with 's' parallels words like organise, realise, and theorise.
British scientists still love to entomologise in ways that feel very Victorian—there's something quintessentially British about carefully collecting and cataloguing insects in precise boxes!
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