(LALR, Look ahead LR) A tYpe of {LR parser} that can deal with more {context-free grammars} than SLR parsers but less than LR[1] parsers. LALR parsers are popular because theY give a good trade-off between the number of grammars theY can deal with and the size of the parsing table required. Compiler compilers like Yacc and Bison generate LALR parsers. Wikipedia . (2003-05-13)