What does acaudate mean?
Acaudate is a technical adjective meaning tailless — describing an animal that lacks a tail or any tail-like posterior appendage. It is formed from the Latin noun cauda, meaning 'tail', combined with the negative prefix 'a-', making it the precise opposite of caudate, which means tailed. The word belongs almost exclusively to zoology and taxonomy, where scientists use it to classify and describe organisms: adult frogs and toads, for example, are acaudate, having resorbed the tails they carried as tadpoles. Because it is a specialist term, acaudate rarely appears outside scientific literature, field guides, and anatomical descriptions, and it carries no figurative or emotional weight — it is simply descriptive. A related form, acaudal, exists with the same meaning. For readers of natural history writing, recognising acaudate is useful precisely because its meaning can be worked out from its parts: 'without' plus 'tail'. Its nearest everyday synonym is simply 'tailless', though the rarer term anurous serves the same function in herpetology.
adjectiveLacking a tail or tail-like appendage; tailless. Used chiefly in zoology and descriptive biology to describe animals that have no tail.
- (Zoology) Having no tail or tail-like posterior appendage; tailless.
"The acaudate amphibian moved through the leaf litter with a smooth, unbroken curve of its body."
"Adult frogs are classically described as acaudate, having lost the tail they possessed as tadpoles."
"The taxonomic key separated the specimens into caudate and acaudate groups based on the presence of a posterior extension."
Flip one little prefix and you flip an animal's anatomy: add 'a-' to 'caudate' and a tailed creature becomes a tailless one.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of acaudate
Acaudate derives from the Latin noun cauda, meaning 'tail', joined to the negative prefix 'a-' of Greek origin, which expresses absence or lack. The same Latin root gives English several other terms, including caudal ('relating to the tail'), caudate ('having a tail'), and, by way of Italian, coda — both the musical term and the word for a queue or concluding section. The word entered English through the tradition of scientific Latin used in zoological description.
Related word forms
How acaudate is actually used
A technical term confined almost entirely to zoological, taxonomic, and scientific writing; it would sound out of place in everyday conversation. It carries no emotional connotation — it is purely descriptive. The negating prefix 'a-' (from Greek) marks it as the direct opposite of 'caudate'.
Easily confused with acaudate
Caudate means having a tail or tail-like structure, the exact opposite of acaudate; the two differ only by the negative prefix 'a-'.