lacuna.

1. A small cavity or space in a biological structure.

2. A missing part or gap in a text, account, record, or body of knowledge.

Use it for

Words that belong together

• a bony lacuna
• tissue lacunae

On the page

The section showed a lacuna within the bony matrix.

She compared the tissue lacunae with the surrounding solid material.

Usage notes

Primary category: horror. Forms: Singular lacuna; plural lacunae or lacunas. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings.