in same sense. [After German tetraxil (1870 or earlier).]
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the world > animals > invertebrates > subkingdom Parazoa > phylum Porifera > [adjective] > relating to a sponge > of parts of sponge > having four axes
tetraxon1886
tetraxile1888
1888 G. Rolleston & W. H. JacksonForms Animal Life (ed. 2) 810 Tetractina: spicules to a great extent tetraxile.