Definition of infra- in English:

infra-

Pronunciation: /ˈɪnfrə/

prefix

1Below: infraorder infrasonic
1.1 Anatomy Below or under a part of the body: infrarenal

Origin

from Latin infra 'below'.

Definition of infra- in:

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Word of the day animalcule
Pronunciation: ˌanəˈmalˌkyo͞ol
noun
a microscopic animal