A patronymic used to form common Irish and Scottish names, similar to the English -son.

plural of mac

plural of Mac

plural of MAC

(astronomy) Abbreviation of MAssive Cluster Survey. A survey for a statistically complete sample of distant (0.7>z>0.3) very X-ray luminous massive clusters of galaxies (“galaxy clusters”), culled from the ROSAT Bright Source Catalogue of X-ray sources

Alternative form of MacArthur

(computing, networking) Media Access Control address; a unique identifying number assigned to most network devices.

A hamburger from the fast food company McDonald's, served on a three-part bun with various condiments.

(finance, informal) The Federal Home Loan Mortgage Corporation (FHLMC), a private, stockholder-owned corporation sponsored by the US government, established in 1968 to provide market competition for the Federal National Mortgage Association.

(informal) An Apple Macintosh computer.