Webster’s Revised Unabridged Dictionary · 1913
Floccus
Floc′cus, n.; pl. Flocci (#). [L., a flock of wool.] 1. (Zoöl.) (a) The tuft of hair terminating the tail of mammals. (b) A tuft of feathers on the head of young birds.
2. (Bot.) A woolly filament sometimes occuring with the sporules of certain fungi.