X87

name

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Definitions

Proper Noun
  1. 1
    An extension to the x86 CPU instruction set architecture, providing direct hardware support for advanced floating-point arithmetic operations (rather than requiring them to be emulated in software).

Etymology

Named after the product designations of the coprocessors used to provide floating-point support on early x86 systems lacking hardware support for these instructions in the main processor: the 8087 (for the 8086/8088 CPU), 80287 (for the 80286 CPU), 80387 (for the 80386 CPU), and 80487SX (for the 80486SX CPU). The 80486DX CPU and later integrated the floating-point hardware into the main processor, but the name continued in use for this set of instructions. The x serves as a wildcard.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.