Learn English – Plural of looker-on and terminus

grammatical-number

I found the plural for Looker-on as both Lookers-on and Looker-ons!!
Is this possible? Also the plural for Terminus is given as Termini and Terminuses!
Please clarify the plurals for Looker-on and Terminus…

Best Answer

According to the Oxford English Dictionary, "terminus" can be pluralized as either "termini" or "terminuses". Terminus is from Latin, wherein termini would be the correct pluralization, and which sounds better to me.

Additionally, the OED only lists "lookers-on" as a word. "Looker-on" is two words connected with a hyphen. The "looker" is pluralized because it's a noun, whereas "on" is a preposition and cannot be pluralized.