semicylinder

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sem·i·cyl·in·der / ˌsemēˈsiləndər; ˌsemˌī-/ • n. Geom. half of a cylinder cut longitudinally.DERIVATIVES: sem·i·cy·lin·dri·cal / ˌsemēˌsəˈlindrikəl; ˌsemˌī-/ adj.

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