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exospore

Exospore
(n.) The extreme outer wall of a spore; the epispore.

knoppern

Knoppern
(n.) A kind of gall produced by a gallfly on the cup of an acorn, -- used in tanning and dyeing.

zoosperm

Zoosperm
(n.) One of the spermatic particles; spermatozoid.

zoospore

Zoospore
(n.) A spore provided with one or more slender cilia, by the vibration of which it swims in the water. Zoospores are produced by many green, and by some olive-brown, algae. In certain species they are divided into the larger macrozoospores and the smaller microzoospores. Called also sporozoid, and swarmspore.
(n.) See Swarmspore.