1. A sedimentary rock composed primarily of sand-sized mineral grains (0.0625–2 mm in diameter), typically cemented together by silica, calcite, or other minerals.
Usage: geology; technical term

Examples

• The geologist identified the sample as an arenite based on its grain size and mineral composition.
• Arenites are commonly found in ancient river and beach deposits.
• The quarry produces high-quality arenite suitable for construction materials.
• This arenite formation dates back to the Cretaceous period.
• The porosity of the arenite makes it useful for groundwater storage.