Antonyms of adj semicircular

1 sense of semicircular

Sense 1
semicircular -- (curved into a half circle)

INDIRECT (VIA curved) -> straight -- (free from curves or angles; "a straight line")

Similarity of adj semicircular

1 sense of semicircular

Sense 1
semicircular -- (curved into a half circle)
       => curved (vs. straight), curving -- (having or marked by a curve or smoothly rounded bend; "the curved tusks of a walrus"; "his curved lips suggested a smile but his eyes were hard")