tetraeterid

From Late Latin tetraeteris, from Ancient Greek τετραετηρίς (tetraetērís), from τετρα- (tetra-, “four”) + ἔτος (étos, “year”).

• (General American) IPA^(key): /ˌtɛtrəˈɛdərəd/
• (Received Pronunciation) IPA^(key): /ˌtɛtrəˈɛtərɪd/

tetraeterid (plural tetraeterids)

1. Alternative form of tetraeteris: A four-year period, particularly (historical) those used in ancient Egyptian and Greek astronomical calculations.

• “tetra-, comb. form”, in OED Online ⁠, Oxford: Oxford University Press, 2022.