Strong's #1154: becer (pronounced beh'-ser)
from an unused root meaning to be sour; an immature grape:--unripe grape.
Brown-Driver-Briggs Hebrew Lexicon:
ּ
beser
1) unripe or sour grapes
Part of Speech: noun masculine collective
Relation: from an unused root meaning to be sour
Usage:
This word is used 1 times:
Job 15:33: "He shall shake off his unripe grape as the vine, and shall cast off his flower as the olive."