Scrabble Dictionary

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Yes, splinter is playable

...and is worth 13 points.

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"Splinter" Definition

noun

A sharp, slender piece, as of wood, bone, glass, or metal, split or broken off from a main body.
A splinter group.
A thin piece or broken off lengthwise .
A small needlelike particle.
A group or faction broken away from a parent body.

verb-transitive

To cause to splinter.

verb-intransitive

To split or break into sharp, slender pieces; form splinters. See Synonyms at break.

verb

To or rend into long thin pieces .
To split into fragments, parts, or factions.
To become .