IPA: /ˌsɛmɪˈsɪlɪndrəl/
KK: /sɛmɪˈsɪlɪndrəl/
Having the shape of half of a cylinder, typically curved on one side and flat on the other.
The architect designed a semicylindrical roof for the new building.
Semicylindrical → It is formed from "semi-" (meaning half) and "cylindricus" (from Latin, meaning cylindrical or relating to a cylinder). The word "semicylindrical" describes a shape that is half of a cylinder.
Think of 'semi-' meaning half and 'cylindrical' relating to a cylinder — so semicylindrical refers to something that is half of a cylinder.