trajectoid

== English == === Etymology === From trajectory +‎ -oid. === Pronunciation === IPA(key): /tɹəˈd͡ʒɛk.tɔɪd/ Rhymes: -ɔɪd === Noun === trajectoid (plural trajectoids) (mathematics) A solid shape that traces a periodic trajectory when rolled down a slope. For more quotations using this term, see Citations:trajectoid.