first finger 
noun
The finger next to the thumb; the forefinger; the index finger.They should be knit with one finger, to allow free use of the first finger and thumb....
- In the past few weeks I've noticed more and more tattoos on people's hands, between their thumb and first fingers.
- He also described the fist with the thumb clenching the first finger as similar to how many people clench the bo (wooden staff).
- born and bred
- born digital
- borne
- Bornean
- Borneo
- born-free
- Bornholm
- Bornholm disease
- born in (or out of) wedlock
- born in (or to) the purple
- bornite
- Born, Max
- born on the wrong side of the blanket
- boro-
- Borobudur
- soleplate
- sole proprietor
- solera
- solera system
- solera wine
- sole trader
- Soleure
- soleus
- soleus muscle
- sol-fa