eight·i·eth 
(ātē-ĭth)
(ātē-ĭth)n.
1. The ordinal number matching the number 80 in a series.
2. One of 80 equal parts.
eighti·eth adv. & adj.
- stroma
- stromal
- stromatic
- stromatolite
- stromatolitic
- Stromboli
- strong
- strong-arm
- strongbox
- strong breeze
- strong force
- strong gale
- stronghold
- strong interaction
- strongish
- strongly
- strongman
- strong-minded
- strong-mindedly
- strong-mindedness
- strong nuclear force
- strongpoint
- strong room
- strongroom
- strong safety