Accelerant
来自Big Physics
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wiktionary
From accelerate + -ant( suffix forming agent nouns from verbs, or forming adjectives with senses of being prone or tending to do the actions of verbs). [1]
etymonline
accelerant (n.)
"that which hastens," especially combustion, 1854, from Latin accelerantem (nominative accelerans), present participle of accelerare "to hasten, quicken" (see accelerate). As an adjective from 1890.