(LALR, Look ahead LR) A type of {LR parser} that can deal with more {context-free grammars} than SLR parsers but less thanLR[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)