(chemistry) A compound or mixture of compounds used to treat or test materials, samples, other compounds or reactants in a laboratory or sometimes an industrial setting.

Alternative form of real-world

The realm of human experience comprising physical objects, and excluding theoretical constructs, hypotheses, artificial environments, and "virtual" worlds such as the Internet, computer simulations, or the imagination.

(idiomatic) To infer a meaning that is not stated explicitly.

(chemistry) Either the oxidation or the reduction component of a redox reaction

A process such as the fission of an atomic nucleus, or the fusion of one or more atomic nuclei and/or subatomic particles in which the number of protons and/or neutrons in a nucleus changes; the reaction products may contain a different element or a different isotope of the same element.

(chemistry) The reaction of a Grignard reagent (an organo-magnesium halide) with aldehydes or ketones to form secondary or tertiary alcohols

(chemistry) an alkyl or aryl magnesium halide, used in the Grignard reaction to form substituted alcohols; they are formed from alkyl or aryl halides and metallic magnesium

(formal, transitive) To make real; to convert from the imaginary or fictitious into reality; to bring into real existence

A check or review to make sure something is consistent, reasonable, etc. / (idiomatic) A wake-up call, reminder.