blastodisc: meaning, definition, pronunciation and examples
very_lowtechnical_specialized
Quick answer
What does “blastodisc” mean?
The small, circular, whitish area of cytoplasm containing the nucleus, located on the surface of the yolk in an avian or reptilian egg.
Audio
Pronunciation
Definition
Meaning and Definition
The small, circular, whitish area of cytoplasm containing the nucleus, located on the surface of the yolk in an avian or reptilian egg.
The region on a telolecithal egg (containing a large yolk) where the embryo begins to develop; the early stage of embryonic development in such eggs before cell division forms the blastoderm.
Dialectal Variation
British vs American Usage
Differences
No significant spelling or usage differences exist. The term is identical in both variants.
Connotations
Identical technical meaning. Usage is confined to scientific literature.
Frequency
Extremely rare in both variants, used exclusively within specialized scientific fields.
Grammar
How to Use “blastodisc” in a Sentence
The blastodisc [VERB: forms, appears, develops] on the yolk.Scientists [VERB: observed, studied] the blastodisc.Vocabulary
Collocations
Examples
Examples of “blastodisc” in a Sentence
adjective
British English
- blastodisc formation
- blastodisc stage
American English
- blastodisc cells
- blastodisc development
Usage
Meaning in Context
Business
Not used.
Academic
Core term in specific biology subfields (embryology, developmental biology, zoology).
Everyday
Never used.
Technical
Precise term for the initial embryonic structure in eggs with large yolks.
Vocabulary
Synonyms of “blastodisc”
Neutral
Weak
Vocabulary
Antonyms of “blastodisc”
Watch out
Common Mistakes When Using “blastodisc”
- Misspelling as 'blastodisk' (acceptable but less common).
- Confusing it with 'blastocyst' (a mammalian embryonic stage).
- Using it as a general term for any early embryo.
FAQ
Frequently Asked Questions
No. A blastodisc is the single-layer disc of cells on top of a large yolk, typical of birds and reptiles. A blastula is a later, spherical stage of embryonic development, usually referring to species with little yolk (like mammals or amphibians).
In a raw, fertilised avian egg (like a chicken's), the blastodisc is visible as a small, whitish spot on the surface of the yolk, often surrounded by a faint ring.
No. Humans have isolecithal eggs (with little, evenly distributed yolk), so the early stages are called zygote, morula, and blastocyst. Blastodisc is specific to telolecithal eggs (with a large yolk mass).
After fertilisation, the blastodisc undergoes rapid cell division (cleavage), forming a multi-layered structure called the blastoderm, which then gives rise to all tissues of the embryo.
The small, circular, whitish area of cytoplasm containing the nucleus, located on the surface of the yolk in an avian or reptilian egg.
Blastodisc is usually technical_specialized in register.
Blastodisc: in British English it is pronounced /ˈblæstə(ʊ)dɪsk/, and in American English it is pronounced /ˈblæstəˌdɪsk/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think: BLAST (explosion of new life) + O + DISC (a small, flat circle). It's the disc-shaped starting point for life in an egg.
Conceptual Metaphor
The blastodisc is the 'launchpad' or 'command centre' for embryonic development on the vast 'landscape' of the yolk.
Practice
Quiz
What is a blastodisc?