A prefix or combining form meaning 'fearful' or 'terrible,' used in scientific names, especially of prehistoric creatures.
From ancient Greek 'δεινός' (deinos, terrible, fearful). Used extensively in paleontology to name dinosaurs and other prehistoric animals that inspired fear or awe.
Scientists named dinosaurs with 'deino-' because they found the enormous skeletons terrifying—'Deinonychus' means 'terrible claw,' which perfectly captures how paleontologists reacted to discovering a raptor with a huge sickle-shaped toe claw.
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