lacuna

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Related to lacunal: lacunar, cicerone

lacuna

a gap, a case not provided for by a statute or in a document.
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significant variation in time, (**) significant variation only in one study site, (***) determined from rates of lacunal gas production, (av.
All isoetids have lacunal air chambers, and in Isoetes species, both aquatic and terrestrial, there are always four lacunae, which, depending on species and habitat, represent 20-90% cross-sectional airspace.
All Isoetes have a single large lacunal chamber that fills the center of the root and varies in cross-sectional area.