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hypo-ellipsoid
hypo-ellipsoid n. 
/ˌhaɪpoʊiˈlɪpˌsɔɪd/ Geometry a curve traced by a point in the circumference of a circle or ellipse rolling along the inside of an ellipse (cf. hypocycloid n.).
Brit. /ˌhʌɪpəʊᵻˈlɪpsɔɪd/
, /ˌhʌɪpəʊᵻˈlɪpsɔɪd/U.S. /ˌhaɪpoʊəˈlɪpˌsɔɪd/
, /ˌhaɪpoʊəˈlɪpˌsɔɪd//ˌhaɪpoʊiˈlɪpˌsɔɪd/ΚΠ
1854 H. Moseley Lect. Astron. (ed. 4) lxi. 183 This curve..being of the nature of an hypo~cycloid, or rather, an hypo-ellipsoid.
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