Definition of "antheridium" []

• A sperm-producing organ occurring in seedless plants, fungi, and algae. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "In Bryophytes, the antheridium is the male sex organ, which produces sperm."
• "It is called an "antheridium," and within are produced, by internal division, numerous excessively small spermatozoids."
• "The male plant has no definite stem, and consists of a single concave leaf protecting the antheridium."