exosporium

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noun

The outer layer of a pollen grain or spore; the exine.

Similar
exineexospore
OriginEnglish spore ← Ancient Greek ἔξω (éxō) →
Scrabble 21
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Meanings

nounexosporium (plural exosporia)

plural exosporia

  1. biologyThe outer layer of a pollen grain or spore; the exine.

    Synonyms: exine, exospore

Synonyms & antonyms

nounThe outer layer of a pollen grain or spore; the exine.

Similar
exineexospore

Origin

  1. Ancient Greekἐκ (ek)
  2. Ancient Greekἔξω (éxō)
  3. Englishexo-
  4. Englishspore
  5. Englishexosporium

From exo- + spore + -ium.

Full word history & related roots →
Cite this entry
APA

exosporium. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/exosporium

MLA

“exosporium.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/exosporium. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “exosporium,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/exosporium.

Source: exosporium on Wiktionary, CC BY-SA 4.0.