FOUR-STROKE ENGINE
\fˈɔːstɹˈə͡ʊk ˈɛnd͡ʒɪn], \fˈɔːstɹˈəʊk ˈɛndʒɪn], \f_ˈɔː_s_t_ɹ_ˈəʊ_k ˈɛ_n_dʒ_ɪ_n]\
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an internal-combustion engine in which an explosive mixture is drawn into the cylinder on the first stroke and is compressed and ignited on the second stroke; work is done on the third stroke and the products of combustion are exhausted on the fourth stroke
By Princeton University
