n. plArctoidea(Zoöl) A group of the Carnivora, that includes the bears, weasels, etc.
Century Dictionary and Cyclopedia
arctoideaOne of three superfamilies of the fissiped or terrestrial carnivorous mammals (the others being Æluroidea and Cynoidea), including the bears and their relatives, as distinguished from the feline and canine members of the Ferœ fissipedia. They have the following characters in common, as contrasted with Æluroidea: a skull with the paroccipital process not closely applied to the auditory bulla; the mastoid process prominent, projecting behind the external auditory meatus; the carotid canal distinct and in advance of the foramen lacerum posterius, which is distinct from the condyloid foramen; the glenoid foramen generally well defined; a large os penis; Cowper's glands not developed; prostate gland not salient; and no intestinal cæcum.
Webster's Revised Unabridged Dictionary
NL., fr. Gr. bear + -oid,
It is less pronounced in some of the omnivorous Arctoidea.
"The Cambridge Natural History, Vol X., Mammalia" by Frank Evers Beddard