How many letters does the top answer for “characterized by partial or total absence of a brain” have?

The most common answer is anencephalic (12 letters).

Crossword clue: characterized by partial or total absence of a brain

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

anencephalic 12 letters wn-def

characterized by partial or total absence of a brain

anencephalous 13 letters wn-def

characterized by partial or total absence of a brain