Etymology
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ultramarine (n.)

1590s, "blue pigment made from lapis lazuli," from Medieval Latin ultramarinus, literally "beyond the sea," from Latin ultra- "beyond" (from suffixed form of PIE root *al- "beyond") + marinus "of the sea," from mare "sea, the sea, seawater," from PIE root *mori- "body of water." Said to be so called because the mineral was imported from Asia.

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Definitions of ultramarine
1
ultramarine (n.)
blue pigment made of powdered lapis lazuli;
Synonyms: ultramarine blue
ultramarine (n.)
a vivid blue to purple-blue color;
2
ultramarine (adj.)
of a brilliant pure blue to purplish blue color;
From wordnet.princeton.edu