Definition of sinople:
(n) :
(mineralogy) Ferruginous quartz of a blood-red or brownish red colour, sometimes with a tinge of yellow, used to make the pigment sinopia.
(n) :
(obsolete) Sinoper, a kind of red earth historically used as a pigment, originally imported to Greece from Sinope in Paphlagonia.
(n) :
(obsolete) A shade of red; sinoper.
(n) :
(obsolete, heraldry) Vert (green).