fat ((fleshed), -ter), fed, firm, plenteous, rank

Boyd’s Bible Dictionary:

(fed). Forbidden food, as belonging to God (Lev. 3:3-17; 7:3,233And he shall offer of the sacrifice of the peace offering an offering made by fire unto the Lord; the fat that covereth the inwards, and all the fat that is upon the inwards, 4And the two kidneys, and the fat that is on them, which is by the flanks, and the caul above the liver, with the kidneys, it shall he take away. 5And Aaron's sons shall burn it on the altar upon the burnt sacrifice, which is upon the wood that is on the fire: it is an offering made by fire, of a sweet savor unto the Lord. 6And if his offering for a sacrifice of peace offering unto the Lord be of the flock; male or female, he shall offer it without blemish. 7If he offer a lamb for his offering, then shall he offer it before the Lord. 8And he shall lay his hand upon the head of his offering, and kill it before the tabernacle of the congregation: and Aaron's sons shall sprinkle the blood thereof round about upon the altar. 9And he shall offer of the sacrifice of the peace offering an offering made by fire unto the Lord; the fat thereof, and the whole rump, it shall he take off hard by the backbone; and the fat that covereth the inwards, and all the fat that is upon the inwards, 10And the two kidneys, and the fat that is upon them, which is by the flanks, and the caul above the liver, with the kidneys, it shall he take away. 11And the priest shall burn it upon the altar: it is the food of the offering made by fire unto the Lord. 12And if his offering be a goat, then he shall offer it before the Lord. 13And he shall lay his hand upon the head of it, and kill it before the tabernacle of the congregation: and the sons of Aaron shall sprinkle the blood thereof upon the altar round about. 14And he shall offer thereof his offering, even an offering made by fire unto the Lord; the fat that covereth the inwards, and all the fat that is upon the inwards, 15And the two kidneys, and the fat that is upon them, which is by the flanks, and the caul above the liver, with the kidneys, it shall he take away. 16And the priest shall burn them upon the altar: it is the food of the offering made by fire for a sweet savor: all the fat is the Lord's. 17It shall be a perpetual statute for your generations throughout all your dwellings, that ye eat neither fat nor blood. (Leviticus 3:3‑17)
3And he shall offer of it all the fat thereof; the rump, and the fat that covereth the inwards, (Leviticus 7:3)
23Speak unto the children of Israel, saying, Ye shall eat no manner of fat, of ox, or of sheep, or of goat. (Leviticus 7:23); Neh. 8:1010Then he said unto them, Go your way, eat the fat, and drink the sweet, and send portions unto them for whom nothing is prepared: for this day is holy unto our Lord: neither be ye sorry; for the joy of the Lord is your strength. (Nehemiah 8:10)); yet fatted cattle enjoyed (1 Kings 4:2323Ten fat oxen, and twenty oxen out of the pastures, and an hundred sheep, beside harts, and roebucks, and fallowdeer, and fatted fowl. (1 Kings 4:23); Luke 15:2323And bring hither the fatted calf, and kill it; and let us eat, and be merry: (Luke 15:23)). Vat is meant (Joel 2:24; 3:1324And the floors shall be full of wheat, and the fats shall overflow with wine and oil. (Joel 2:24)
13Put ye in the sickle, for the harvest is ripe: come, get you down; for the press is full, the fats overflow; for their wickedness is great. (Joel 3:13); Hag. 2:1616Since those days were, when one came to an heap of twenty measures, there were but ten: when one came to the pressfat for to draw out fifty vessels out of the press, there were but twenty. (Haggai 2:16)).

Concise Bible Dictionary:

This portion of the sacrifices was to be burned on the altar. “All the fat is the Lord's. It shall be a perpetual statute for your generations throughout all your dwellings, that ye eat neither fat nor blood” (Lev. 3:16-1716And the priest shall burn them upon the altar: it is the food of the offering made by fire for a sweet savor: all the fat is the Lord's. 17It shall be a perpetual statute for your generations throughout all your dwellings, that ye eat neither fat nor blood. (Leviticus 3:16‑17)). Apparently, as to the fat, this refers to that "of ox, or of sheep, or of goat," the animals of sacrifice, and to the fat of any animal that died of itself, or was torn of beasts (Lev. 7:23-2423Speak unto the children of Israel, saying, Ye shall eat no manner of fat, of ox, or of sheep, or of goat. 24And the fat of the beast that dieth of itself, and the fat of that which is torn with beasts, may be used in any other use: but ye shall in no wise eat of it. (Leviticus 7:23‑24)). In Nehemiah 8:1010Then he said unto them, Go your way, eat the fat, and drink the sweet, and send portions unto them for whom nothing is prepared: for this day is holy unto our Lord: neither be ye sorry; for the joy of the Lord is your strength. (Nehemiah 8:10) it was proclaimed, “eat the fat,” without any restriction; but here the Hebrew word is different, and refers more to “dainties.” In Isaiah 25:66And in this mountain shall the Lord of hosts make unto all people a feast of fat things, a feast of wines on the lees, of fat things full of marrow, of wines on the lees well refined. (Isaiah 25:6) is another Hebrew word, and is “fat or rich things.” The “fat” signifies the best part, the inward energy and will: (Compare Num. 18:2929Out of all your gifts ye shall offer every heave offering of the Lord, of all the best thereof, even the hallowed part thereof out of it. (Numbers 18:29) margin; Psalm 73:44For there are no bands in their death: but their strength is firm. (Psalm 73:4) margin). It is typical of the inward energy of the Lord Jesus in the offering of Himself to God.

Strong’s Dictionary of Hebrew Words:

Number:
1277 (find all occurrences in KJV Bible)
Transliteration:
bariy’
Phonic:
baw-ree’
Meaning:
from 1254 (in the sense of 1262); fatted or plump
KJV Usage:
fat ((fleshed), -ter), fed, firm, plenteous, rank