Standard Lemma guide

thallus

noun · 3 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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  • UK, US: /ˈθæl.əs/
  • Southern-England: Recorded audio is listed in the source snapshot.
  • rhymes with -æləs

1

noun

Meaning 1

An undifferentiated plant body, such as in algae.

Definition source: English Wiktionary via Wiktextract

Topics: biology, botany, natural-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

Any plant body lacking vascular tissue.

Definition source: English Wiktionary via Wiktextract

Topics: biology, botany, natural-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

noun

Meaning 3

a plant body without true stems or roots or leaves or vascular system; characteristic of the thallophytes

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: plant part, plant structure

Narrower terms: crustose thallus

History

Etymology

From Ancient Greek θαλλός (thallós, “young shoot, twig”), from Proto-Indo-European *dhelh1- (“to bloom”).

Across languages

Translations

11 source translations are retained for this English entry.

  • Bulgarian: талус (talus) — thallus
  • Dutch: thallus — thallus
  • Finnish: sekovarsi — thallus
  • French: thalle — thallus
  • German: Thallus — thallus
  • Hungarian: telep — thallus
  • Ido: talo — thallus
  • Italian: tallo — thallus
  • Polish: plecha — thallus
  • Sicilian: taḍḍu — thallus
  • Volapük: talut — thallus
Real reading context

thallus in complete knowledge articles