a product of the seeds of a tropical tree, Azadirachta indica, of the mahogany family, that disrupts reproduction in insects, used as an insecticide.
Also called neem tree, nim tree, margosa. the tree itself.

1805–15; < Hindi nīm < Sanskrit nimba Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
neem (niːm)
a large tree of India, Azadirachta indica, all parts of which are useful to man: the leaves act as a natural pesticide, the fruit and seeds yield a medicinal oil, the bark is used to make a tonic, and the trunk exudes a gum
[C19: from Hindi nīm, from Sanskrit nimba]

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Example sentences
Neem oil suffocates insects and contains pesticide properties.
Neem is so benign that it appears in some brands of toothpaste.
Neem cake is a byproduct obtained in the solvent extraction process for neem oil.
The neem oil enhanced the local immune response in the uterus.
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