1. Right-lined; bounded by right lines; straight.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• rectalinear,
• recilineal,
• rectilinneal,
• rectilineal,
• rectalineal,
• eectilinear,
• dectilinear,
• fectilinear,
• tectilinear,
• 5ectilinear,
• 4ectilinear,
• rwctilinear,
• rsctilinear,
• rdctilinear,
• rrctilinear,
• r4ctilinear,
• rectlinear,
• rectilnear,
• rectiliner,
• recitlinear

• rectal vein,
• rectilineal.

The adjective form of the word "rectilinear" is "rectilinear".

The plural form of the word "rectilinear" is "rectilinear" as it is an adjective that does not change when made plural.

The singular form of the word "rectilinear" is "rectilinearity"