The American Heritage® Dictionary of the English Language: Fourth Edition. 2000.
Appendix I
Indo-European Roots
ENTRY:
nek-2
DEFINITION:
To reach, attain. Oldest form *ne-, becoming *nek- in centum languages. I. O-grade form *nok-.enough, from Old English geng, enough, from Germanic *ganga-, sufficient, from *ga-nah, suffices (*ga-, intensive prefix; see kom). II. Variant form *enk-.1.oncogenesis, oncology, from Greek reduplicated enenkein, to carry (suppletive aorist of pherein, to carry; see bher-), with derived noun onkos, a burden, mass, hence a tumor (from suffixed o-grade *onk-o-; see 2 below). 2. Suffixed o-grade form *onk-o-.baisa, paisa, pice, from Sanskrit aa, part, portion. 3. Compound root *bhrenk- (see bher1). (Pokorny ene- 316.)