semicylinder

[ sem-ee-sil-in-der, sem-ahy- ]
/ ˌsɛm iˈsɪl ɪn dər, ˌsɛm aɪ- /

noun

half of a cylinder divided lengthwise.

Origin of semicylinder

First recorded in 1660–70; semi- + cylinder
Related formssem·i·cy·lin·dri·cal [sem-ee-si-lin-dri-kuh l, sem-ahy-] /ˌsɛm i sɪˈlɪn drɪ kəl, ˌsɛm aɪ-/, sem·i·cy·lin·dric, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019