μητρῳσμός
From LSJ
ποιητὴς, ὁπόταν ἐν τῷ τρίποδι τῆς Μούσης καθίζηται, τότε οὐκ ἔμφρων ἐστίν → whenever a poet is seated on the Muses' tripod, he is not in his senses
English (LSJ)
Dor. ματρ-, ὁ, (μητρῴζω) celebration of the festival of Cybele, Phint. ap. Stob.4.23.61,61a (both pl.).
Greek (Liddell-Scott)
μητρῳσμός: Δωρ. ματρ-, ὁ, τὸ ἑορτάζειν τὴν ἑορτὴν τῆς Κυβέλης, Φίντυς παρὰ Στοβ. 444. 23, 445. 22.