कौस्तुभ (kaustubha) m. n. (cf. कुस्त् (kust)° (°)), N. of a celebrated jewel (obtained with thirteen other precious things at the churning of the ocean and suspended on the breast of Kṛṣṇa or Viṣṇu), Mahābhārata (Title) ; Harivaṃśa (Title) ; Rāmāyaṇa (Title) &c. [ID=57583]
— Monier-Williams Sanskrit-English Dictionary (1899)