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polyactine
polyactine n. 
/ˌpɒlɪˈaktɪn/, /ˌpɑliˈæktən/ Zoology rare a polyactinal sponge spicule.
Brit. /ˌpɒlɪˈaktiːn/
, /ˌpɒlɪˈaktiːn//ˌpɒlɪˈaktɪn/U.S. /ˌpɑliˈækˌtin/
, /ˌpɑliˈækˌtin//ˌpɑliˈæktən/ΘΚΠ
the world > animals > invertebrates > subkingdom Parazoa > phylum Porifera > [noun] > member of > parts of > sponge spicule > having rays
oxyaster1886
polyaxon1887
rhabd1890
polyactine1902
1902 Encycl. Brit. XXXII. 813/1 Fig. 5 A, typical polyactine.
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