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macroarrow, barrow, farrow, harrow, Jarrow, marrow, narrow, sparrow, taro, tarot, Varro, yarrow •gabbro • Avogadro • Afro • aggro •macro • cilantro • Castro •wheelbarrow •Faro, Kilimanjaro, Pissarro, Pizarro, Tupamaro •Pedro • allegro • hedgerow • velcro •escrow •metro, retro •electro • Jethro •bolero, caballero, dinero, Faeroe, pharaoh, ranchero, sombrero, torero •scarecrow • Ebro •Montenegro, Negro •repro • in vitroPyrrho • synchro •windrow • impro • intro • bistro •Babygro • McEnroe •biro, Cairo, giro, gyro, tyro •fibro • micro • maestro •borrow, Corot, morrow, sorrow, tomorrow •cockcrow • cointreau •Moro, Sapporo, Thoreau •Mindoro • Yamoussoukro •Woodrow •burro, burrow, furrow •upthrow •De Niro, hero, Nero, Pierrot, Pinero, Rio de Janeiro, sub-zero, zero •bureau, chiaroscuro, Douro, enduro, euro, Ishiguro, Oruro, Truro •Politburo • guacharo • Diderot •vigoro • Prospero • Cicero • in utero •Devereux • Jivaro • overthrow

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macro Short for macroinstruction. An instruction in a programming language (almost always but not necessarily assembly language) that is replaced by a sequence of instructions prior to assembly or compiling. A macroassembler permits the user to define macros, specifying the macroinstruction form, its arguments, and a replacement text (otherwise called the body of the macro), and then allows macroinstructions to be interspersed among the assembly code. On encountering a macro the assembler replaces it by the macro body, substituting the parameters provided in the places marked in the macro body. The macro thus provides a mechanism for inserting a particular body of text at various places in a program (and is thus the same thing as an open subroutine, though this nomenclature is obsolete).

A macroprocessor provides similar facilities, though not in combination with an assembler. It accepts macro definitions and then reads arbitrary text in which macro calls (i.e. instances of a macro name) can occur. Text is copied to the output until a macro name is encountered: when this happens the arguments (parameters) are found and the macro call is replaced by the macro body in the output stream, with appropriate substitution of the parameters.

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mac·ro / ˈmakrō/ • n. (pl. -ros) 1. (also macro instruction) Comput. a single instruction that expands automatically into a set of instructions to perform a particular task. 2. Photog. short for macro lens. • adj. 1. large-scale; overall: the analysis of social events at the macro level. Often contrasted with micro. 2. Photog. relating to or used in macrophotography.