spider fly: meaning, definition, pronunciation and examples
Low (specialist/entomological)Technical/Scientific, occasionally informal descriptive
Quick answer
What does “spider fly” mean?
A small, predatory fly of the family Acroceridae, which parasitises spiders.
Audio
Pronunciation
Definition
Meaning and Definition
A small, predatory fly of the family Acroceridae, which parasitises spiders; an insect resembling a spider in appearance or movement.
Can refer informally to crane flies or other long-legged flies whose appearance evokes a spider. In some contexts, used metaphorically to describe something that combines attributes of both creatures (e.g., something delicate yet predatory).
Dialectal Variation
British vs American Usage
Differences
No significant regional difference in the technical term. Informal descriptive use might be slightly more common in UK English for crane flies ('daddy longlegs').
Connotations
Neutral in scientific context. Can have a slightly eerie or unsettling connotation in descriptive use.
Frequency
Very low frequency in general discourse. Almost exclusively found in entomology texts or detailed nature writing.
Grammar
How to Use “spider fly” in a Sentence
The [spider fly] parasitises [spider].A [spider fly] was observed on [the window/leaf].Vocabulary
Collocations
Examples
Examples of “spider fly” in a Sentence
adjective
British English
- The spider-fly life cycle is complex.
- We studied spider-fly interactions.
American English
- The spider fly lifecycle is complex.
- We studied spider fly interactions.
Usage
Meaning in Context
Academic
Used in entomology, ecology, and evolutionary biology papers discussing parasitism.
Everyday
Virtually never used. Might be used by gardeners or naturalists describing an unusual insect.
Technical
Precise taxonomic reference to flies in the family Acroceridae.
Vocabulary
Synonyms of “spider fly”
Neutral
Weak
Vocabulary
Antonyms of “spider fly”
Watch out
Common Mistakes When Using “spider fly”
- Using 'spiderfly' as one word (standard is two words).
- Confusing it with a 'flying spider' (which doesn't exist).
- Assuming it is a type of spider rather than a fly.
FAQ
Frequently Asked Questions
It is a true fly (order Diptera), not a spider. The name refers to its parasitic relationship with spiders or its spider-like appearance.
No. They are very small, rarely bite humans, and pose no threat. They are only a danger to their spider hosts.
Yes, but they are rarely noticed due to their small size and inconspicuous behaviour. Their presence indicates a healthy spider population.
They are different families. Spider flies (Acroceridae) are parasitic and have small, often humpbacked bodies. Crane flies (Tipulidae) are not parasitic, have long, slender bodies, and are often seen indoors.
A small, predatory fly of the family Acroceridae, which parasitises spiders.
Spider fly is usually technical/scientific, occasionally informal descriptive in register.
Spider fly: in British English it is pronounced /ˈspaɪ.də ˌflaɪ/, and in American English it is pronounced /ˈspaɪ.dɚ ˌflaɪ/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Imagine a fly wearing a tiny spider costume for Halloween – it's a 'spider fly'.
Conceptual Metaphor
HYBRID/CHIMERA (combining features of two distinct entities).
Practice
Quiz
What is a 'spider fly' primarily?