Where does “apoapsides” come from?

apoapsides (English) comes from English apsides, from Ancient Greek ἁψῖδες, from Ancient Greek ἁψίς, from Ancient Greek -σῐς, from Ancient Greek -τις, from Proto-Indo-European -tis — Derives abstract/action nouns from verb roots.

apoapsides (English): plural of apoapsis

Definitions

  1. plural of apoapsis

Ancestry of “apoapsides”, step by step

apoapsides traces back through two separate lines of ancestry.

via English apsides

StepLanguageWordMeaning
1Englishapsidesplural of apside; plural of apsis
2Ancient Greekἁψῖδες
3Ancient Greekἁψίςnet, mesh; wheel, hoop, disc; Any curved form:...
4Ancient Greek-σῐς"suffix forming nouns"
5Ancient Greek-τιςretained after dentals
6Proto-Indo-European-tisDerives abstract/action nouns from verb roots

via English apo

StepLanguageWordMeaning
1EnglishapoIn an inactive, unbound state
Every word from Proto-Indo-European -tisEvery word from Ancient Greek -σῐςEvery word from Ancient Greek ἁψίς