Atavistic

Adjective

Definition: Relating to or characterized by a reversion to an earlier or ancestral type or characteristics.

Synonyms: Ancestral, Primitive, Throwback

Antonyms: Modern, Current, Contemporary

Examples:

His behavior displayed an atavistic instinct.
The development of feathers in reptiles is considered an atavistic trait.

Mnemonics:

Think of "atavistic" as "at backwardness" - reverting back to older characteristics.

Etymology:

Origin:

The word "atavistic" is derived from the Latin word "atavus" (a great-great-great-grandparent) and the suffix "-istic" (indicating a characteristic or quality). It was first used in English in the mid-19th century.

Historical Usage:

The term "atavistic" gained popularity in the context of evolution and genetics, describing the reappearance of ancestral traits in individuals or species.

Related Idioms:

Idiom:

"Atavistic tendencies"

Explanation:

Refers to the presence or display of inherited or primitive characteristics or behaviors.

Misconceptions:

Misconception:

Confusing "atavistic" with "antiquated" or "outdated."

Explanation:

While "atavistic" does involve a reversion to an earlier type, it specifically refers to ancestral or primitive characteristics, not necessarily to something that is no longer relevant or useful.