The Collaborative International Dictionary
Infralabial
Infralabial \In`fra*la"bi*al\, a. (Zo["o]l.) Below the lower lip; -- said of certain scales of reptiles and fishes.
Wiktionary
infralabial
a. (context zoology English) Below the lower lip; said of certain scales of reptiles and fishes. n. Any scale below the lower lip.