1. Members of a Christian monastic order founded in the 13th century, following the rule of Saint Benedict with stricter observance.
Usage: historical; religious; usually capitalized
2. Plural of celestine; a pale blue mineral form of strontium sulfate.
Usage: mineralogy; technical

Examples

• The Celestines established monasteries throughout medieval Europe.
• Pope Celestine V was associated with the founding of the Celestine order.
• Celestines were known for their strict adherence to monastic discipline.
• The mineral celestine deposits were discovered in various limestone formations.
• Geologists identified celestines in the rock samples collected from the quarry.