Boyd’s Bible Dictionary:
(cumberer). Much used for food in the East (Num. 11:5; lsa. 1:8).
Concise Bible Dictionary:
Probably the watermelon, common in Egypt and highly valued in that hot country: the Israelites longed for them (Num. 11:5; Isa. 1:8).
Strong’s Dictionary of Hebrew Words:
Transliteration:
qishshu’
Meaning:
from an unused root (meaning to be hard); a cucumber (from the difficulty of digestion)