Resembling or made of alabaster; having the smooth, white, translucent qualities characteristic of alabaster stone.
From alabaster plus the suffix -ine, used to form adjectives meaning 'like' or 'made of.' This suffix comes from Latin and became common in English scientific and descriptive terminology.
Victorian sculptors were absolutely obsessed with alabastrine statues because the stone was soft enough to carve into incredibly detailed lace-like patterns, yet sturdy enough to last centuries in a drawing room!
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