<p><strong>Noun</strong></p><ul><li>a gap or missing part, as in a manuscript, series, or logical argument; hiatus</li><li>one of the numerous minute cavities in the substance of bone, supposed to contain nucleate cells (Anatomy)</li><li>an air space in the cellular tissue of plants (Botany)</li></ul><p><strong>Plural</strong></p><ul><li>lacunae</li><li>lacunas</li></ul>