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Webster 1913 Edition

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Noun.

;

pl.

Sori

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[NL., fr. Gr. [GREEK] a heap.]

(Bot.)

One of the fruit dots, or small clusters of sporangia, on the back of the fronds of ferns.

sorus ‎(plural sori)

(mycology, lichenology) Any reproductive structure, in some lichens and fungi, that produces spores.
(botany) A cluster of sporangia on the edge or underside of a fern frond.