IPA: /ˌrɛk.tɪˈlɪn.i.ər/
KK: /rɛkˈtɪlɪnɪər/
Describing something that moves or is arranged in straight lines rather than curves.
The architect designed a building with a rectilinear shape to give it a modern look.
Rectilinear → It is formed from "rectus" (meaning straight) and "linea" (meaning line). The word "rectilinear" describes something that is characterized by straight lines.
Think of 'straight' ('rectus') and 'line' ('linea') to remember that 'rectilinear' refers to something made up of straight lines.