Definition of -acean in English:

-acean

Pronunciation: /ˈeɪʃ(ə)n/

suffix

Zoology
Forming the singular of group names ending in -acea (such as crustacean from Crustacea).

Origin

from Latin -aceus 'of the nature of' + -an.

Definition of -acean in:

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