a. 开展的, 扩展的, 张开的, 张口状的

[医] 开放的, 扩展的

Patulous \Pat"u*lous\, a. [L. patulus, fr. patere to be open,
extend.]
Open; expanded; slightly spreading; having the parts loose or
dispersed; as, a patulous calyx; a patulous cluster of
flowers.

The eyes are large and patulous. --Sir J. Hill.