Infra is valid Scrabble Word

Is infra a scrabble word?
Official Scrabble Players Dictionary YES
Official Tournament and Club Word List YES
Collins Scrabble Words YES
Is infra valid Words with Friends?
Words with Friends YES

5 letters word
8 points in Scrabble
9 points in WWF

Definitions for INFRA in dictionary:

VERB:

Below; beneath; under; after; -- often used as a prefix.

ADVERB:

(Latin) below; later in a text
(in a written document) below; further on
(esp in textual annotation) below
(in writing) see below

How to use INFRA in a sentence

Caput et truncus supra tesserulis minutis, infra squamis minimis, tecti.
Truncus supra sqoamis crassis elongatis subspinosis, infra hexagonis membranaceis imbricatis, tectus.
Stylus trigonus strictus, infra villosus, dimidio superiore glabro, altitudine staminum, iisdem paulo praecocior, exsertus nempe dum illa adhuc inclusa.

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