peripheral primitive neuroectodermal tumour
1. . PPO abbr. preferred provider organization preferred provider organization
Project-Programmer Number. A user-ID under TOPS-10 and its various mutant progeny at SAIL, BBN, CompuServe and elsewhere. Old-time hackers from the PDP-10 era sometimes use this to refer to user IDs on other systems as well. [Jargon File] (1994-11-18)
[poo l-bak] /ˈpʊlˌbæk/ noun 1. the act of pulling back, especially a retreat or a strategic withdrawal of troops; pullout. 2. that which pulls something back or impedes its forward movement. 3. Machinery. a device for pulling a moving part to its original position.
noun 1. . [sel-bahy] /ˈsɛlˌbaɪ/ noun 1. the last date on which perishable food should be sold, usually established with some allowance for home storage under refrigeration. Compare . Idioms 2. past one’s / its sell-by date, Informal. past one’s or its prime; past the period of greatest vigor, success, etc.: an aging actress, well […]