Second collective name for the Seven Sages, 'the bright-crested ones', given as a straight synonym of Saptarṣayaḥ. Colebrooke glosses the verse 'Ursa major' and names the seven in a footnote. Cross-confirmed internally: six verses earlier the Amarakośa calls Bṛhaspati citraśikhaṇḍija, 'son of a Citraśikhaṇḍin' (i.e. of Aṅgiras, one of the seven).
चित्रशिखण्डिनः Citraśikhaṇḍinaḥ
Big Dipper / Great Bear · α–η Ursae Majoris · Ursa Major
Attestations
CE lines 12,322.026a and 12,322.027a/027c; the ellipsis marks the omitted 026c. Vulgate chapter numbering for the Nārāyaṇīya differs from the CE; Ganguli's corresponding Śānti Parva section was not fetched.
The Mahābhārata is in fact the locus classicus for this name, which the database currently carries only from the lexicons. Nārāyaṇīya 12.322.26-27 names 'the seven munis famed as the Citraśikhaṇḍins' and then lists them individually: Marīci, Atri, Aṅgiras, Pulastya, Pulaha, Kratu and Vasiṣṭha — the same seven the Bṛhat Saṃhitā maps onto α–η UMa. HONEST CAVEAT on the discrimination test: in this passage they are treated as sages who authored a śāstra, not explicitly as stars, so the passage attests the NAME for the seven but not, by itself, a celestial reference. The name itself ('bright-crested') is stellar in force, and the seven are the standard star-seven, which is why it is recorded here as likely rather than certain.