# acaleph

CEFR C2 · Noun

Source: https://englishreference.com/word/acaleph
Updated: 2026-05-19

## Definition

a very old word for a jellyfish. You might see it in old books or scientific papers from a long time ago.

For teachers: a member of the phylum Cnidaria, specifically a jellyfish. Archaic in modern usage; primarily found in historical biological texts or as a scientific name in older nomenclature.

## Examples

- The acaleph drifted through the dark waters.
- In older scientific literature, the term acaleph was used to describe the various species of jellyfish found in the ocean.
- While the modern classification of cnidarians has evolved significantly, the term acaleph persists in certain historical contexts to refer to the gelatinous, free-swimming forms of the group.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.