Upper arm muscle, for short (3)
I believe the answer is:
tri
(Other definitions for tri that I've seen before include "Prefix denoting three" , "Denotes three" , "Prefix indicating three" , "Prefix meaning three" , "Three-point" .)
I believe the answer is:
tri
(Other definitions for tri that I've seen before include "Prefix denoting three" , "Denotes three" , "Prefix indicating three" , "Prefix meaning three" , "Three-point" .)