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sinsemilla
sinter
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sinuate
sinuosity
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sinus node
sinus venosus
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siphuncle

si·phun·cle [ s fùngk'l ] (plural si·phun·cles)


noun 
Definition:
 
gas-secreting tissue in mollusk: a cord of tissue that secretes gas into the buoyancy chambers of the external shell of a nautilus or similar mollusk

[Early 19th century. < Latin siphunculus "small tube" < siphon- (see siphon)]

si·phun·cu·lar [ s fúngkyələr ] adjective
si·phun·cu·late [ s fúngkyələt ] adjective
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