Strong's #1858: dar (pronounced dar)

apparently from the same as 1865; properly, a pearl (from its sheen as rapidly turned); by analogy, pearl-stone, i.e. mother-of-pearl or alabaster:--X white.

Brown-Driver-Briggs Hebrew Lexicon:

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dar

1) pearl, mother of pearl

Part of Speech: noun masculine

Relation: apparently from the same as H1865

Usage:

This word is used 1 times:

 

Esther 1:6: "a pavement of red, and blue, and white, and black marble."