plural lacunae
lə-ˈkyü-(ˌ)nē
-ˈkü-ˌnī
also lacunas
lə-ˈkü-nəz
-ˈkyü-
1
: a blank space or a missing part : gap
the evident lacunae in his story—
Shirley Hazzard
also
: deficiency sense 1
despite all these lacunae, those reforms were a vast improvement —
New Republic
2
: a small cavity, pit, or discontinuity in an anatomical structure
lacunar
adjective
or less commonly lacunate
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Merriam-Webster unabridged
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