Cuban spinach cu·bans·pi·nach uncommon noun 1. succulent herb sometimes grown as a salad or pot herb; grows on dunes and waste ground of Pacific coast of North America Synonymswinter purslaneminer's lettuceCuban spinachMontia perfoliata Related words Broader terms Indian lettuce WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.