Form Form, v. t. (Elec.) To treat (plates) so as to bring them to fit condition for introduction into a storage battery, causing one plate to be composed more or less of spongy lead, and the other of lead peroxide. This was formerly done by repeated slow alternations of the charging current, but now the plates or grids are coated or filled, one with a paste of red lead and the other with litharge, introduced into the cell, and formed by a direct charging current., form form [See Form, n.] A suffix used to denote in the form or shape of, resembling, etc.; as, valiform; oviform., Form Form, v. i. 1. To take a form, definite shape, or arrangement; as, the infantry should form in column. 2. To run to a form, as a hare. --B. Jonson. To form on (Mil.), to form a lengthened line with reference to (any given object) as a basis.