fas·tig·i·um 
(fă-stĭjē-əm)
(fă-stĭjē-əm)n.
The period of maximum severity or intensity of a disease or fever.
[Latin fastīgium, apex, height.]
- first-class
- first class
- first cousin
- first day cover
- first-degree burn
- first down
- first edition
- first family
- first finger
- first floor
- first fruits
- firstfruits
- first-generation
- first gentleman
- firsthand
- first home
- first-in, first-out
- first lady
- first lieutenant
- first-line
- firstling
- firstly
- first mate
- first name
- First Nation