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amphidisk

noun
am·​phi·​disk
variants: or amphidisc \ ˈamfəˌdisk \
plural -s

Definition of amphidisk 

: a spicule having a stellate disk at each end found in the reproductive bodies of freshwater sponges of the genus Spongilla and in some of the Hyalospongiae

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First Known Use of amphidisk

1856, in the meaning defined above

History and Etymology for amphidisk

amphi- + disk, disc

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The first known use of amphidisk was in 1856

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