Webster’s Revised Unabridged Dictionary · 1913 Polyplacophora Pol′y·pla·coph′o·ra (pŏl′ĭ·plȧ·kŏf′ō·rȧ), n. pl. [NL. See Poly-, and Placophora.] (Zoöl.) See Placophora. ‹ Polypite Polyplastic ›