be sick of a fever

Concise Bible Dictionary:

The words in the originals imply “a burning heat,” so that there is no doubt that what is commonly known as “fever” is intended (Deut. 28:2222The Lord shall smite thee with a consumption, and with a fever, and with an inflammation, and with an extreme burning, and with the sword, and with blasting, and with mildew; and they shall pursue thee until thou perish. (Deuteronomy 28:22); Matt. 8:14-1514And when Jesus was come into Peter's house, he saw his wife's mother laid, and sick of a fever. 15And he touched her hand, and the fever left her: and she arose, and ministered unto them. (Matthew 8:14‑15); Luke 4:38-3938And he arose out of the synagogue, and entered into Simon's house. And Simon's wife's mother was taken with a great fever; and they besought him for her. 39And he stood over her, and rebuked the fever; and it left her: and immediately she arose and ministered unto them. (Luke 4:38‑39); John 4:5252Then inquired he of them the hour when he began to amend. And they said unto him, Yesterday at the seventh hour the fever left him. (John 4:52); Acts 28:88And it came to pass, that the father of Publius lay sick of a fever and of a bloody flux: to whom Paul entered in, and prayed, and laid his hands on him, and healed him. (Acts 28:8)). The same Hebrew word is translated BURNING AGUE in Leviticus 26:1616I also will do this unto you; I will even appoint over you terror, consumption, and the burning ague, that shall consume the eyes, and cause sorrow of heart: and ye shall sow your seed in vain, for your enemies shall eat it. (Leviticus 26:16).

Strong’s Dictionary of Greek Words:

from 4443; to be on fire, i.e. (specially), to have a fever
KJV Usage:
be sick of a fever