1. 
[syn: archetypal, archetypical, prototypal, prototypic, prototypical]
WordNet (r) 3.0 (2006):
prototypal
    adj 1: representing or constituting an original type after which
           other similar things are patterned; "archetypal
           patterns"; "she was the prototypal student activist"
           [syn: archetypal, archetypical, prototypal,
           prototypic, prototypical]
Moby Thesaurus II by Grady Ward, 1.0:
19 Moby Thesaurus words for "prototypal":
   antitypic, archetypal, archetypic, classic, classical, exemplary,
   ideal, model, paradigmatic, primary, prototypic, quintessential,
   representative, uncopied, unduplicated, unexampled, unimitated,
   unprecedented, unreproduced