1) Family trichodontidae 2) Fish family 
The Trichodontidae, or sandfishes, are a small perciform family of fishes that occur in the North Pacific. The family consists of two monotypic genera: ...
(from the article `sandfish`) The small, scaleless northern Pacific sandfishes of the family Trichodontidae (order Perciformes) have vertical mouths and fringed lips. Often, they ...
[n] - two species of elongate compressed scaleless large-eyed fishes that live in sand or mud
family Trichodontidae noun two species of elongate compressed scaleless large-eyed fishes that live in sand or mud