Definition of infra- in English:

infra-

Syllabification: infra-

prefix

1Below: infrared 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 neoteny
Pronunciation: nēˈätn-ē
noun
retention of juvenile features in the adult animal