Word Study
natatorial
CIDE DICTIONARY
natatorial, a.
Inclined or adapted to swim; swimming; as, natatorial birds. [1913 Webster]
OXFORD DICTIONARY
natatorial, adj. (also natatory) formal 1 swimming.
2 of or concerning swimming.
2 of or concerning swimming.
Etymology
LL natatorius f. L natator swimmer (as NATATION)
For further exploring for "natatorial" in Webster Dictionary Online