Where does “sinologia” come from?

sinologia (Portuguese) comes from Portuguese sino-, from Medieval Latin Sina, from Latin Sīnae, from Ancient Greek Σῖναι, from Arabic صِين, from Pahlavi čīn, from Sanskrit चीन, from Old Chinese 秦 — {{w|Qin |State of Qin}}, {{w|Qin dynasty}}; Qin.

sinologia (Portuguese): sinology