virgulate
/ˈvɜːɡjʊleɪt, ˈvɜr-/Definitions
1. verb
to mark or indicate the presence of a vein or a blood vessel by a line or a small cut
“The pathologist had to virgulate the sample to identify the underlying structure.”
2. noun
a small cut or incision made to mark the presence of a vein or a blood vessel
“The doctor made a careful virgulate to locate the vein for the blood test.”