lamella

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A thin scale, plate, or layer of bone or tissue, as in the gills of a bivalve mollusk or around the minute vascular canals in bone.

[Latin lāmella, small thin plate, diminutive of lāmina, thin plate.]

A reinforced concrete, metal, or wood member joined with similar members in a crisscross pattern so as to form an arch or vault.

A thin layer, membrane, or plate of tissue. For example, the concentric ring of hard bone in compact bone.

Pl. lamellae [L.]
1. a thin scale or plate, as of bone.
2. a medicated disk or wafer to be inserted under the eyelid.

• circumferential l. — one of the bony plates that underlie the periosteum and endosteum.
• concentric l. — haversian lamella (see below).
• endosteal l. — one of the bony plates lying beneath the endosteum.
• ground l. — interstitial lamella (see below).
• haversian l. — one of the concentric bony plates surrounding a haversian canal.
• intermediate l. — one of the bony plates that fill in between the haversian systems; called also interstitial lamella.
• interstitial l. — see intermediate lamella (above).
• intrasinusal l. — incomplete partitions which divide the frontal sinus of the horse into a number of communicating diverticula.