ˈsōrəs, ˈsȯr- noun
( plural so·ri -ōrˌī, -ȯˌrī)
Etymology: New Latin, from Greek sōros heap; akin to Latin tumēre to swell — more at thumb
: a cluster of reproductive bodies or spores on a lower plant: as
a. : a clump of sporangia on a fertile frond of a fern
b. : a mass of spores bursting through the epidermis of the host plant of a parasitic fungus
c. : a cluster of gemmae on the thallus of a lichen