Triangle definition, a closed plane figure having three sides and three angles. An equilateral triangle is on in which all three sides are equal in length. The coastline of chile and argentina and brazil forms two legs. I have just noticed an annoying triangle symbol appears when i am editing in word. Words containing the letters t,r,i,a,n,g,l,e in any order we have listed all the words in the english dictionary that have the exact letters triangle in (in order), have a look below to see all the words we have found seperated into character length.
