OED: That roars loudly; noisy, boisterous. 1824 Blackwood's Edinb. Mag. 15 675 We leave that‥to critics of a more polyphloisboian note. 1858 O. W. Holmes Autocrat of Breakfast-table iv, Two men are walking by the polyphlœsbœan ocean. 1881 Fortn. Rev. No. 179. 560 The unreliable, erratic, polyphloisbean Loewenbruk also put in an appearance. 1997 D. Albright Quantum Poetics ii. 200 A genuinely polyphloisboian line would have been wholly out of place in this poem.