Ichthyology belonging to the family Trichomycteridæ (or Pygidiidæ) of fishes (cat-fishes), found in South American rivers ( Cent. Dict.); also as noun; compare trichomycterineadj. [ < scientific Latin Trichomycterus, genus name (see trichomycterineadj.) + -oidsuffix, after scientific Latin Trichomycteridae (1872 or earlier).]