Etymology
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ochre (n.)

common name of a type of clayey soil much used in pigments, late 13c., oker, ocre, from Old French ocre (c. 1300) and directly from Medieval Latin ocra, from Latin ochra, from Greek khra, from khros "pale yellow," a word of unknown origin. It consists hydrated sesquioxids of iron mixed with various earthy materials, principally silica and alumina. As a color name, "brownish-yellow," it is attested from mid-15c. Related: Ochreous.

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Definitions of ochre
1
ochre (n.)
any of various earths containing silica and alumina and ferric oxide; used as a pigment;
Synonyms: ocher
ochre (n.)
a moderate yellow-orange to orange color;
Synonyms: ocher
2
ochre (adj.)
of a moderate orange-yellow color;
Synonyms: ocher
From wordnet.princeton.edu