zygotoblast, n.

zygotoblast
http://www.oed.com/dictionary/zygotoblast_n%3Ftab%3Dmeaning_and_use
First published 1921; not fully revised

# zygotoblastnoun

## Factsheet

### What does the noun zygotoblast mean?

There is one meaning in OED's entry for the noun zygotoblast. See ‘Meaning & use’ for definition, usage, and quotation evidence.

#### Entry status

OED is undergoing a continuous programme of revision to modernize and improve definitions. This entry has not yet been fully revised.

### How common is the noun zygotoblast?

Fewer than 0.01occurrences per million words in modern written English

1900 | 0.0016
1910 | 0.0014
1920 | 0.0011
1930 | 0.0009
1940 | 0.0002
1950 | 0.0001
1960 | 0.00004
1970 | 0.00004
1980 | 0
1990 | 0
2000 | 0
2010 | 0

### Where does the noun zygotoblast come from?

Earliest known use

1890s

The earliest known use of the noun zygotoblast is in the 1890s.

### Nearby entries

1. zygospore, n. 1864–
2. zygosporic, adj. 1906–
3. zygostat, n. 1623
4. zygostatical, adj. 1656
5. zygostyle, n. 1881–
6. zygote, n. 1891–
7. zygotene, n. 1911–
8. zygotic, adj. 1909–
9. -zygotic, comb. form
10. zygotically, adv. 1915–
11. zygotoblast, n.1899–
12. zygotoid, n. 1891–
13. zygotomere, n. 1899–
14. -zygous, comb. form
15. zygozoospore, n. 1881–
16. Zyklon, n. 1939–
17. zymad, n. 1885–
18. zymase, n. 1875–
19. zymate, n. 1817–19
20. zyme, n. 1882–
21. zymic, adj. 1817–26

## Etymology

‑blast comb. form.

## Meaning & use

Biology.

1. 1899–
   One of a number of germ-cells or sporozoites produced by budding from a zygotomere (see below).
   Stressed as zyˈgotoblast.
   1. 1899

      > Zygotoblasts

      [see zygotomere n.].
   life sciences physiology
   1. zoozygosphere 1880–
      (In algae and fungi) a motile gamete; also called planogamete, zoogamete.
   2. zygotoblast 1899–
      One of a number of germ-cells or sporozoites produced by budding from a zygotomere (see below).
   3. zygotomere 1899–
      One of a number of cells formed by segmentation of a zygote in the malaria parasite or other Sporozoa.
   View in Historical Thesaurus

## Frequency

zygotoblast typically occurs fewer than 0.01 times per million words in modern written English.

zygotoblast is in frequency band 1, which contains words occurring fewer than 0.001 times per million words in modern written English. More about OED's frequency bands

Frequency data is computed programmatically, and should be regarded as an estimate.

### Frequency of zygotoblast, n., 1900–2010

* Occurrences per million words in written English

Historical frequency series are derived from Google Books Ngrams (version 2), a data set based on the Google Books corpus of several million books printed in English between 1500 and 2010.

The overall frequency for a given word is calculated by summing frequencies for the main form of the word, any plural or inflected forms, and any major spelling variations.

For sets of homographs (distinct entries that share the same word-form, e.g. mole, n.¹, mole, n.², mole, n.³, etc.), we have estimated the frequency of each homograph entry as a fraction of the total Ngrams frequency for the word-form. This may result in inaccuracies.

Smoothing has been applied to series for lower-frequency words, using a moving-average algorithm. This reduces short-term fluctuations, which may be produced by variability in the content of the Google Books corpus.

Decade | Frequency per million words
--- | ---
1900 | 0.0016
1910 | 0.0014
1920 | 0.0011
1930 | 0.0009
1940 | 0.0002
1950 | 0.0001
1960 | 0.00004
1970 | 0.00004
1980 | 0
1990 | 0
2000 | 0
2010 | 0

Originally published as part of the entry for zygote, n.

zygote, n. was first published in 1921; not fully revised.