plica

A fold or ridge, as of skin, membrane, or shell.

In pathology, a matted, filthy condition of the hair, from disease. Also called plica polonica, helosis, and trichosis.

In botany, a diseased state in plants in which the buds, instead of developing true branches, become short twigs, and these in their turn produce others of the same sort, the whole forming an entangled mass.

In zoology and anatomy, a fold or folding of a part.

In entomology, a prominent ridge or carina, often turned over or inclined to one side, so that it appears like a fold; specifically, a longitudinal ridge on the internal surface of each elytron, near the outer edge; an elytral ridge, found in certain Coleoptera.

In herpetology: [capitalized] A genus of American iguanoid lizards: named from the folds of skin on the sides.

A lizard of this genus: as, the dotted plica, P. punctata.

In mensural music: A kind of grace-note.

A kind of ligature

The stem or tail of a note.