Strong’s Hebrew
H5919 — `akshuwb
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
עַכְשׁוּב
`akshuwb — pronounced ak-shoob
probably from an unused root meaning to coil; an asp (from lurking coiled up):--adder.
1 occurrence in the KJV.
Psalms 140:3
They have sharpened their tongues like a serpent; adders’ poison is under their lips. Selah.