say it: em
em is a noun meaning "a quad with a square body". It carries 2 recorded senses.
a quad with a square body
“since `em quad' is hard to distinguish from `en quad', printers sometimes called it a `mutton quad'”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for em come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.