WordNet (r) 3.0 (2006):

sans serif
    n 1: a typeface in which characters have no serifs [syn: sans
         serif, Helvetica]

Moby Thesaurus II by Grady Ward, 1.0:

49 Moby Thesaurus words for "sans serif":
   ascender, back, bastard type, beard, belly, bevel, black letter,
   body, cap, capital, case, counter, descender, em, en, face,
   fat-faced type, feet, font, groove, italic, letter, ligature,
   logotype, lower case, majuscule, minuscule, nick, pi, pica, point,
   print, roman, script, shank, shoulder, small cap, small capital,
   stamp, stem, type, type body, type class, type lice, typecase,
   typeface, typefounders, typefoundry, upper case