means A speckle-breasted songbird of the family Turdidae prized for its rich melodious song — and, by a quirk of naming, a yeast infection (Candida) that coats the mouth or other moist parts of the body in creamy white patches.

from The bird's name is ancient, descending from Old English 'þrysce,' a Germanic word kin to 'throstle' and likely a cousin of Latin 'turdus,' all reaching back to a prehistoric root for the bird. The disease 'thrush' is a separate puzzle: it surfaces in English in the 1600s, and its source is genuinely uncertain — the leading guess connects it to Scandinavian words like Danish 'troske' for the infection, while the resemblance to the bird's name appears to be coincidence, not a poetic comparison to a speckled breast.