MAINSPRING
\mˈe͡ɪnspɹɪŋ], \mˈeɪnspɹɪŋ], \m_ˈeɪ_n_s_p_ɹ_ɪ_ŋ]\
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the most important spring in a mechanical device (especially a clock or watch); as it uncoils it drives the mechanism
By Princeton University
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the most important spring in a mechanical device (especially a clock or watch); as it uncoils it drives the mechanism
By DataStellar Co., Ltd
By William Dodge Lewis, Edgar Arthur Singer
By James Champlin Fernald