rectilineal /rek-ti-linˈi-əl/ or rectilinear /rek-ti-linˈi-ər/ adjective

1. (L līnea a line) in a straight line or lines
2. Straight
3. Bounded by straight lines

rectilinearity /-arˈi-ti/ noun

rectilinˈearly or rectilinˈeally adverb

rectipetality /rek-ti-pi-talˈi-ti/ or rectipetaly /-petˈəl-i/ noun (L petere to seek; botany)

Tendency to grow in a straight line

rectirostral /rek-ti-rosˈtrəl/ adjective

(L rōstrum a beak) straight-billed

rectiserial /rek-ti-sērˈi-əl/ adjective

(L seriēs a row) in straight rows