Where does “мигдалъ” come from?

мигдалъ (Old Church Slavonic) comes from Greek αμύγδαλο, from Ancient Greek ἀμύγδαλον — almond.

Ancestry of “мигдалъ”, step by step

Step	Language	Word	Meaning
1	Greek	αμύγδαλο	almond
2	Ancient Greek	ἀμύγδαλον	almond