The Collaborative International Dictionary of English v.0.48:

Nestor \Nes"tor\, prop. n. (Zool.)
   A genus of parrots with gray heads, of New Zealand and Papua,
   allied to the cockatoos. See Kaka.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Nestor
    n 1: (Greek mythology) a wise old counselor to the Greeks at
         Troy
    2: a genus of Psittacidae [syn: Nestor, genus Nestor]

Moby Thesaurus II by Grady Ward, 1.0:

20 Moby Thesaurus words for "nestor":
   Dutch uncle, Polonius, admonisher, adviser, backseat driver,
   buttinsky, confidant, consultant, counsel, counselor, expert,
   guide, instructor, kibitzer, meddler, mentor, monitor, orienter,
   preceptist, teacher



Moby Thesaurus II by Grady Ward, 1.0:

43 Moby Thesaurus words for "Nestor":
   Buddha, Confucius, Father Time, Gandhi, Mentor, Methuselah,
   Old Paar, Plato, Socrates, Solomon, centenarian, dotard, elder,
   gaffer, geezer, golden-ager, gramps, grandfather, grandsire,
   graybeard, nonagenarian, octogenarian, old chap, old codger,
   old dog, old duffer, old geezer, old gent, old gentleman, old man,
   old party, old-timer, older, oldster, pantaloon, patriarch,
   presbyter, senior citizen, septuagenarian, sexagenarian,
   the quiet-voiced elders, venerable sir, veteran