TROCHOID
\tɹˈə͡ʊkɔ͡ɪd], \tɹˈəʊkɔɪd], \t_ɹ_ˈəʊ_k_ɔɪ_d]\
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By Oddity Software
By Noah Webster.
By Henderson, I. F.; Henderson, W. D.
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Pivot-like or pulley-shaped.
By Willam Alexander Newman Dorland