A thickened horny or bony plate on a turtle's shell or on the back of a crocodile, stegosaurus, etc.‘Our recapture data indicated that Texas tortoises accumulate 1 annulus/yr and the scute annuli technique is a useful indicator of age in this population.’
- ‘The higher estimate was based on growth curves from scute rings, which may have underestimated carapace growth, and a minimum size of females with eggs of 155 mm.’
Middle English (denoting a coin): from Latin scutum.
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