Main Entry: la·cu·na

Pronunciation: \lə-ˈkü-nə, -ˈkyü-\

Function: noun

Inflected Form(s): plural la·cu·nae \-ˈkyü-(ˌ)nē, -ˈkü-ˌnī\ also la·cu·nas \-ˈkü-nəz, -ˈkyü-\

Etymology: Latin, pool, pit, gap — more at lagoon

Date: 1652

1 : a blank space or a missing part : gap <the evident lacunae in his story — Shirley Hazzard>; also : deficiency 1 <despite all these lacunae, those reforms were a vast improvement — New Republic>
2 : a small cavity, pit, or discontinuity in an anatomical structure

— la·cu·nar \-ˈkü-nər, -ˈkyü-\ also la·cu·nate \lə-ˈkü-nət, -ˈkyü-, -ˌnāt; ˈla-kyə-ˌnāt\ adjective