sideform

noun3

1. •
   Any of the forms used when setting concrete with this method.
2. •
   A process for setting concrete which uses forms to confine the concrete to the desired width.

   • Two basic methods of paving are in use in South Africa, namely, sideform and slipform. With the sideform method, metal sideforms are used to confine the concrete to the desired width. — 1982
3. •
   (rare) An alternative or variant form of a word or morpheme.

   • The old þina, g. s. of þu, = of-thee, has such sideforms as the oldest Swedish sina, gen. sing, of the reflective pronoun, and as the M. Goth. seina, […] — 1866