Wordnet 3.0
NOUN (1)
1.
a medical specialist in hygiene;
The Collaborative International Dictionary of English v.0.48:
Hygienist \Hy"gi*en*ist\, n.
One versed in hygiene.
[1913 Webster]
WordNet (r) 3.0 (2006):
hygienist
n 1: a medical specialist in hygiene