D defs.my
Entry 1 sense Webster, 1913

Wellspring

/wĕl'-sprĭngˌ/ · Well·spring · IPA /ˈwɛlsprɪŋ/
01 n. A fountain; a spring; a source of continual supply.
  1. 1.
    A fountain; a spring; a source of continual supply.
    “Understanding is a wellspring of life unto him that hath it; but the instruction of fools is folly.” — Prov. xvi. 22.