glochidium

Definitions

  • WordNet 3.6
    • n glochidium a barbed spine or bristle (often tufted on cacti)
    • ***
Webster's Revised Unabridged Dictionary
    • n Glochidium (Zoöl) The larva or young of the mussel, formerly thought to be a parasite upon the parent's gills.
    • ***
Century Dictionary and Cyclopedia
    • n glochidium [capitalized] In zoology, a generic name given to the young of certain fresh-water mussels, as Unio and Anodonta, which are hatched in the gills of the parent, and were at one time supposed to be parasites. Rathke
    • n glochidium In botany, a hair-like appendage to the massulæ of heterosporous Filicineæ, by which the massulæ attach themselves to the macrospores after both have been discharged into the water.
    • ***

Etymology

Webster's Revised Unabridged Dictionary
NL., fr. Gr. the point of an arrow