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natural, organic

natural: in the context of agriculture and chemical products, the terms natural and naturally derived should only be used to refer to substances and products that are 100% formed naturally, without the use of synthetic components or processes. See also green, sustainable

organic: in agriculture, refers to practices and products that do not use synthetic fertilisers or pesticides. In chemistry, an organic compound is any carbon compound, apart from a few types of compounds such as carbides, carbonates, simple oxides of carbon (e.g. CO and CO2) and cyanides

necropsy

See autopsy, necropsy, postmortem

neoplasm

See cancer, neoplasm, tumour

noncommunicable

See communicable, contagious, infectious, infective, noncommunicable, transmissible

nonflammable

See flammable, inflammable, nonflammable

null hypothesis

A null hypothesis is the negative counterpart of a hypothesis. It is the hypothesis that the researcher seeks to reject so that the hypothesis of interest can be accepted.