Strong’s Greek
G4088 — pikria
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
πικρία
pikria — pronounced pik-ree'-ah
from 4089; acridity (especially poison), literally or figuratively:--bitterness. see GREEK for 4089
4 occurrences in the KJV.
Acts 8:23
For I perceive that thou art in the gall of bitterness, and in the bond of iniquity.
Romans 3:14
Whose mouth is full of cursing and bitterness:
Ephesians 4:31
Let all bitterness, and wrath, and anger, and clamour, and evil speaking, be put away from you, with all malice:
Hebrews 12:15
Looking diligently lest any man fail of the grace of God; lest any root of bitterness springing up trouble you, and thereby many be defiled;