Definition of -acal in English:

-acal

Syllabification: -acal

suffix

Forming adjectives from nouns and adjectives usually ending in -ac, such as maniacal, often making a distinction from nouns ending in -ac (as in maniacal compared with maniac).

Definition of -acal in:

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Word of the day neoteny
Pronunciation: niːˈɒt(ə)ni
noun
retention of juvenile features in the adult animal