millet

Boyd’s Bible Dictionary:

Here a grass; abroad a cereal, like broomcorn
(Ezek. 4:9).

Concise Bible Dictionary:

Panicum Miliaceum
Small seeds used as an ingredient in coarse bread or in pottage (Ezek. 4:9). The Hebrew word is held to embrace at least two species of millet, the Sorghum vulgare and the Panicum miliaceum.
Panicum Miliaceum
Sorghum Vulgare

Strong’s Dictionary of Hebrew Words:

Number:
1764 (find all occurrences in KJV Bible)
Transliteration:
dochan
Phonic:
do’-khan
Meaning:
of uncertain derivation; millet
KJV Usage:
millet