Where does “agnosia” come from?

agnosia (Portuguese) comes from Ancient Greek ἀγνωσία, from Ancient Greek ἀγνώς, from Ancient Greek ἀ-, from Proto-Hellenic hə-, from Proto-Indo-European sm̥-, from Proto-Indo-European sem- — together, one.

agnosia (Portuguese): agnosia the inability to recognise objects

Definitions

agnosia the inability to recognise objects

Ancestry of “agnosia”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	ἀγνωσία	ignorance; obscurity
2	Ancient Greek	ἀγνώς	in passive constructions; ignorant
3	Ancient Greek	ἀ-	The alpha privativum, used to make words that...
4	Proto-Hellenic	hə-	same; together
5	Proto-Indo-European	sm̥-	one; with, together
6	Proto-Indo-European	sem-	together, one

Every word from Proto-Indo-European sem- →Every word from Ancient Greek ἀ- →Every word from Proto-Indo-European sm̥- →