An obsolete or highly technical zoological term possibly referring to a group or classification of waterfowl or duck-related organisms.
From Latin anas 'duck' plus -nacea, a Latin suffix used in older taxonomies to denote a group or family. This term is largely obsolete in modern classification.
Scientific names constantly change—old classifications like anatinacea get replaced with better genetic understanding, so even dictionaries struggle with extinct technical terms.
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