Entry 1 sense Webster, 1913 Danburite · Dan·bu·rite · IPA /ˈdænbəɹaɪt/ 01 n. A borosilicate of lime, first found at Danbury, Conn. It is near the topaz in form. 1. A borosilicate of lime, first found at Danbury, Conn. It is near the topaz in form.(Min.)