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There are 2 thirteen-letter words beginning with BIR

BIRDWATCHINGSBIRDWATCHING n. the occupation of watching birds.
BIREFRINGENCEbirefringence n. (Physics) The splitting of a ray of light into two parallel rays of perpendicular polarization by passage…
BIREFRINGENCE n. the refraction of light in an anisotropic material (as calcite) in two slightly different directions to form two rays.

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 1Word.ws and WikWik.org.

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