The headword, evidently quoted from somewhere (perhaps from the quotation below, but attested elsewhere only in Theophrastus, e.g. Enquiry into Plants 2.2.2, 3.9.4, and On the Causes of Plants 1.9.2), is nominative plural of this adjective.
[1] The thyrsus was a wand with a pine-cone at the top, carried in Dionysian rites as explained; see theta 613.
[2] The conical shape of the heart is remarked on by the late medical author Meletius, On the Nature of Humans p. 97 Cramer. The remarks made here do not appear to have been preserved elsewhere.
[3] Greek Anthology 6.165.4 (Phalaecus), also at theta 613. On this epigram, a dedication to Dionysus, see Page (46-49) and its further extracts at alpha 1721, alpha 4681, beta 140, beta 548, theta 379, iota 72, kappa 2115, lambda 360, rho 223, and sigma 1193. On the epigram's attribution, see alpha 1721 note. As Page notes (48), artwork depicting a thyrsus often shows the staff topped with a pinecone-like object. A representative example is the pelike by the red-figure vase painter Hermonax (fl. 470-430 BCE) in the National Etruscan Museum of Villa Giulia in Rome; cf. Isler-Kerényi (70-71). For a defense of the thesis that the thyrsus became associated with a pinecone only in the 19th century, see Olszewski (153-173).