източник

и́зток (íztok, “lit. outflow”) +‎ -ник (-nik)

• IPA^(key): [ˈistot͡ʃnik]

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и́зточник • (íztočnik) m

1. (dated) fountain, spring (source of flow)

   Synonyms: и́звор (ízvor), вир (vir)

   Antonym: отто́чник (ottóčnik)

2. (figurative) source, fount, root (place, thing, or stock that provides foundation for something to emerge)

   светли́нен и́зточник ― svetlínen íztočnik ― light source

   топли́нен и́зточник ― toplínen íztočnik ― heat source

3. (by extension) origin, basis, beginning

   Synonyms: нача́ло (načálo), прои́зход (proízhod)

4. (by extension) provenance, place of genesis

   Synonym: произхожде́ние (proizhoždénie)

5. (judiciary) informant, provider (person who provides information or evidence)

   и́зточник на све́дения ― íztočnik na svédenija ― provider of information

• първои́зточник (pǎrvoíztočnik, “primary source”)

• изти́чам (iztíčam, “to outflow, to leak, to expire”)
• изто́чвам (iztóčvam, “to drain”)
• то́чник (tóčnik) (obsolete)
  • отто́чник (ottóčnik, “drainage, sink”)
  • прото́чник (protóčnik, “conductor”)
  • сто́чник (stóčnik, “point of confluence, merging”) (dated)

• “източник”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Sofia: Bulgarian Academy of Sciences, 2014
• “източник”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Chitanka, 2010