lime
noun
1.
a caustic substance produced by heating limestone
Derived from:
lime 2.
a white crystalline oxide used in the production of calcium hydroxide
Derived from:
lime 3.
4.
any of various related trees bearing limes
5.
any of various deciduous trees of the genus Tilia with heart-shaped leaves and drooping cymose clusters of yellowish often fragrant flowers; several yield valuable timber
6.
the green acidic fruit of any of various lime trees