What does polygōnālis mean in Latin?

polygōnālis, a adjective, means “polygonal”.

How do you pronounce polygōnālis?

In classical Latin, [pɔ.ly.ɡoːˈnaː.lɪs]; in ecclesiastical (church) Latin, [po.li.ɡoˈnaː.lis].

adjectivethird-declension two-termination adjective

polygōnālis (neuter polygōnāle)

Classical[pɔ.ly.ɡoːˈnaː.lɪs]Ecclesiastical[po.li.ɡoˈnaː.lis]

two terminationpolygonal
Cellulae quadrangulares, trapeziformes, vel irregulariter polygonales (si ramificant), 6-8/μm latae, 10-12/μm longae.Cells quadrangular, trapezoidal, or irregularly polygonal (if branching), 6-8/μm wide, 10-12/μm long.1973 March 31, Bohuslav Fott, “Protoderma daphnicola sp. nov. (Ulotrichales, Chlorophyceae), a New Epibiontic Alga Growing on Daphnia”, in British Phycological Journal, volume 8, number 1 (overall work in English and Latin), →DOI, page 39 of 39-41:

singular
form	masculine	feminine	neuter
nominative	polygōnālis	polygōnālis	polygōnāle
genitive	polygōnālis	polygōnālis	polygōnālis
dative	polygōnālī	polygōnālī	polygōnālī
accusative	polygōnālem	polygōnālem	polygōnāle
ablative	polygōnālī	polygōnālī	polygōnālī
vocative	polygōnālis	polygōnālis	polygōnāle

plural
form	masculine	feminine	neuter
nominative	polygōnālēs	polygōnālēs	polygōnālia
genitive	polygōnālium	polygōnālium	polygōnālium
dative	polygōnālibus	polygōnālibus	polygōnālibus
accusative	polygōnālīs polygōnālēs	polygōnālīs polygōnālēs	polygōnālia
ablative	polygōnālibus	polygōnālibus	polygōnālibus
vocative	polygōnālēs	polygōnālēs	polygōnālia

Proto-Italic *-ālis Latin -ālis Latin polygōnālis From polygōnum + -ālis.