Definition of "hygienic"

hygienic

/haɪˈd͡ʒiːnɪk/

adjective
comparative more hygienic, superlative most hygienic
1. Pertaining to hygiene; clean, sanitary.
2. (programming slang, of a macro) Whose expansion is guaranteed not to cause the accidental capture of identifiers.
  Quotations
  Of course, anyone with a Scheme background is probably howling at this point because they have a hygienic macro system that makes unintended variable capture impossible. Allowing variable capture when we really, really want it makes Clojure's macro system technically more dangerous than hygienic systems.
  2014, Colin Jones, Mastering Clojure Macros: Write Cleaner, Faster, Smarter Code, Pragmatic Bookshelf