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There are 7 words beginning with INFRAS

INFRASONIC	• infrasonic adj. (Of sound waves, acoustics) Having frequencies below the human audible range. • infrasonic adj. (Of a device) Generating or employing such sound waves. • INFRASONIC adj. having or relating to a frequency below the audibility range of the human ear.
INFRASOUND	• infrasound n. (Physics) Sound waves having a frequency below the human audible range (below about 20 Hz). • INFRASOUND n. frequencies below the usual audible limit.
INFRASOUNDS	• infrasounds n. Plural of infrasound. • INFRASOUND n. frequencies below the usual audible limit.
INFRASPECIFIC	• infraspecific adj. (Taxonomy) pertaining to a taxon at a rank lower than species, such as subspecies (in certain kingdoms… • INFRASPECIFIC adj. of taxonomic divisions of a lower rank than species.
INFRASTRUCTURE	• infrastructure n. (Systems theory) An underlying base or foundation especially for an organization or system. • infrastructure n. The basic facilities, services and installations needed for the functioning of a community or society. • INFRASTRUCTURE n. the underlying foundation or basic framework (as of a system or organization).
INFRASTRUCTURAL	• infrastructural adj. Of, relating to or originating in infrastructure. • INFRASTRUCTURAL adj. of or like an infrastructure.
INFRASTRUCTURES	• infrastructures n. Plural of infrastructure. • INFRASTRUCTURE n. the underlying foundation or basic framework (as of a system or organization).

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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English Wiktionary: 37 words
Scrabble in French: 10 words
Scrabble in Spanish: 16 words
Scrabble in Italian: 56 words
Scrabble in German: no word
Scrabble in Romanian: 21 words

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