|1.||em, Also called: pica em a printer's unit of measurement, equal to 12 points or 0.166 ins|
|2.||(formerly) a size of printer's type equal to 12 point|
|3.||a typewriter type size having 10 characters to the inch|
|[C15: from Anglo-Latin pīca list of ecclesiastical regulations, apparently from Latin pīca magpie, with reference to its habit of making collections of miscellaneous items; the connection between the original sense (ecclesiastical list) and the typography meanings is obscure]|
pica pi·ca (pī'kə)
An abnormal craving or appetite for nonfood substances, such as dirt, paint, or clay.