By analogy: Anything flat and thin. Obsolete. A thin layer (of any material), a leaf, paring.

A thin piece of wood or metal; spec. a board of a book (Old English), a toe- or heel-plate (dialect).

A thing that resembles a leaf in being flat and thin; a sheet or layer of something; a lamina. Cf. lantern-leaves n. at lantern, n. compounds 2.

A lamina; a thin plate or layer (of metal, etc.); a plate of metal used as an astrological instrument or as a charm.

A thin plate, esp. of metal; a thin piece of any substance, a lamina; spec. applied to the small overlapping steel plates used in old armour.

Any of the thin pieces of metal composing scale-armour; = scale, n.2 7a.

A thin plate, scale, layer, or flake (of metal, etc.).

= lamella, n.

A thin plate, scale, layer, or film, esp. of bone or tissue; e.g. one of the thin scales or plates which compose some shells, one of the gills…