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Definition of topmouth

topmouth

/ˈtɑːp.maʊθ/
top · mouth
Plural:topmouths
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topmouth Lexical Profile

• noun

1

A small freshwater cyprinid fish, most notably the topmouth gudgeon (Pseudorasbora parva), native to Asia but widely known as a highly invasive species in European waterways, characterized by its upward-pointing mouth.

Example

"Conservationists implemented strict biosecurity measures to prevent the topmouth from infesting the native trout fisheries."

Synonyms
View all synonyms for topmouth

Word Nuance & Usage

Most frequently encountered as part of the common name 'topmouth gudgeon', an invasive freshwater fish, rather than as a standalone noun in general conversation.

• Nearby Words

topline
topminnow
topmost
topmouth
topnotch
topographic
topographical

Word Origin & Etymology

A descriptive compound of 'top' and 'mouth', referencing the superior (upward-pointing) anatomical position of the fish's mouth, an adaptation for surface feeding.

Usage Trend

Historical frequency of usage in published text.

180019102020
Data source: Google Books Ngram Viewer

Cite this Entry

Wordmom. (2026). Definition of Topmouth. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/topmouth
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