Definitions

1. adjective

relating to or resembling a pectin, especially a ridge or fold in the wall of a cell or an organ, or a pectinate structure, such as a comb-like or fan-like arrangement of parts

“The pectinal scales on the fish’s body allowed it to maneuver through the coral reef with ease.”

2. noun

a pectin or a pectinate structure, especially one resembling a comb or a fan

“The pectinal ridges on the leaf’s surface helped it to absorb water more efficiently.”