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 The word   is in the Wiktionary1 short excerpt of Wiktionnary (A collaborative project to produce a free-content dictionary.)— English word —- regular␣open adj. (Rare, mathematics, of a set) Being the interior of its closure.
 
 9 English words from the English definitionBeing closure interior its mathematics of␣a Rare set the 27 words-in-word (Words found as is inside the word. Minimum size 3 letters.)aro ARO gul Gul gül gula Gula gular lar LAr LAR ope 'ope open pen Pen PEN reg Reg regu regula Regula regular ROP rope Ula ULA 26 words-in-word RTL (Words found written from right to left, inside the word. Minimum size 3 letters.)alu ALU Epo EPO ger Ger GER Ger. Ger⁺⁶ lug Lug LUG luge luger Luger nep Nep NEP nepo ora Ora oral Oral POR poral RAL 
 
 
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