naiant
Concise Oxford English Dictionary © 2008 Oxford University Press:
naiant /ˈneɪənt/
▶adjective [postpos.] Heraldry (of a fish or marine creature) swimming horizontally.
– origin C16: from Anglo-Norman Fr., var. of OFr. noiant, noier ‘to swim’.
'naiant' also found in these Oxford entries:

