vi·cen·ni·al 
(vī-sĕnē-əl)
(vī-sĕnē-əl)adj.
1. Happening once every 20 years.
2. Existing or lasting for 20 years.
[From Late Latin vīcennium, period of twenty years : Latin vīciēns, twenty times (from vīgintī, twenty; see VICENARY) + Latin annus, year; see at- in the Appendix of Indo-European roots.]
- neural
- neural arch
- neural crest
- neuralgia
- neuralgic
- neurally
- neural net
- neural network
- neural plate
- neural tube
- neural tube defect
- neuraminidase
- neurasthenia
- neurasthenic
- neurasthenically
- neurectomy
- neurilemma
- neurilemmal
- neuristor
- neuritic
- neuritis
- neuro-
- neuroanatomical
- neuroanatomist
- neuroanatomy