diactine
noun
di·ac·tine
(ˈ)dīˈakˌtīn,
-tə̇n
variants
or diact
or less commonly diactin
ˈdīˌakt
(ˈ)dīˈaktə̇n
plural -s
: a sponge spicule having two pointed arms
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Merriam-Webster unabridged
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