[ree-ak-tuh nt] /riˈæk tənt/
a person or thing that .
Also called interactant. Chemistry. any substance that undergoes a chemical change in a given .
a substance that participates in a chemical reaction, esp a substance that is present at the start of the reaction Compare product (sense 4)
1901 (n.), 1911 (adj.), from react + -ant.
reactant re·ac·tant (rē-āk’tənt)
A substance participating in a chemical reaction, especially a directly reacting substance present at the start of the reaction.
A substance participating in a chemical reaction, especially one present at the start of the reaction.
[ree-akt] /riˈækt/ verb (used with object) 1. to or perform again. [ree-akt] /riˈækt/ verb (used without object) 1. to act in response to an agent or influence: How did the audience react to the speech? 2. to act reciprocally upon each other, as two things. 3. to act in a reverse direction or manner, especially […]
[ree-ak-shuh n] /riˈæk ʃən/ noun 1. a reverse movement or tendency; an action in a reverse direction or manner. 2. movement in the direction of political conservatism or extreme rightism. 3. action in response to some influence, event, etc.: the nation’s reaction to the president’s speech. 4. Physiology. action in response to a stimulus, as […]
[ree-ak-shuh-ner-ee] /riˈæk ʃəˌnɛr i/ adjective 1. of, pertaining to, marked by, or favoring , especially extreme conservatism or rightism in politics; opposing political or social change. noun, plural reactionaries. 2. a reactionary person. /rɪˈækʃənərɪ; -ʃənrɪ/ adjective 1. of, relating to, or characterized by reaction, esp against radical political or social change noun (pl) -aries, -ists […]
noun, Aeronautics, Rocketry. 1. an engine that produces power as a reaction to the momentum given to gases ejected from it, as a rocket or jet engine. noun 1. an engine, such as a jet or rocket engine, that ejects gas at high velocity and develops its thrust from the ensuing reaction