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Spey
Speyer
SPF
Spgs.
sphagnum
sphalerite
sphecid
sphen-
sphene
spheno-
sphenodon
sphenoid
sphenoid bone
spher-
sphere
sphere of influence
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sphene
sphene [ sfeen ]


noun 
Definition:
 
titanium-containing mineral: a brown black mineral composed of calcium titanium silicate. Source: igneous rocks.
[Early 19th century. Via French< Greek sphēn "wedge"]
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