naught also nought 
(nôt)
(nôt)n.
1. Nonexistence; nothingness.
2. The figure 0; a cipher; a zero.
pron.
Nothing: All their work was for naught.
adj.
1. Nonexistent.
2. Insignificant.
[Middle English, from Old English nāwiht : nā, no; see ne in the Appendix of Indo-European roots + wiht, thing; see wekti- in the Appendix of Indo-European roots.]
- perimysium
- perinatal
- perinatally
- perinatology
- perineal
- perinephral
- perinephrial
- perinephric
- perinephrium
- perineum
- perineurial
- perineurium
- period
- periodic
- periodic acid
- periodical
- periodical cicada
- periodically
- periodic attractor
- periodicity
- periodic law
- periodic motion
- periodic sentence
- Periodic Table
- periodontal