ameiosisn.

Brit.

/ˌeɪmʌɪˈəʊsɪs/, U.S.

/ˌeɪˌmaɪˈoʊsəs/

Forms: see a- prefix⁶ and meiosis n.

Origin: Formed within English, by derivation. Etymons: a- prefix⁶, meiosis n.

Etymology: < a- prefix⁶ + meiosis n. (compare sense 3 at that entry). Compare earlier ameiotic adj.

Biology.

In meiosis: the production of diploid, rather than haploid, gametes.Haploid gametes are typically formed when one of the two nuclear divisions normally occurring in meiosis is absent.

ΚΠ

1922 P. B. Sears in Bot. Gaz. 73 320 It seems, therefore, that the designation ‘ameiosis’, or ‘amiosis’, proposed by Sears in 1917..and indicating a type of maturation which obviates necessity for subsequent fertilization, is to be preferred to ‘homotypic mitosis’, a term of very explicit implications.

1943 L. W. Sharp Fund. Cytol. xiv. 206 Abnormal temperature, either high or low, may induce ameiosis in flower buds, so that diploid spores and gametes become available for crossing.

2014 Internat. Rev. Hydrobiol. 99 117 We tested effects on senescence of..female reproductive physiology (asexual females that reproduce by ameiosis, vs. sexual females reproducing by meiosis).

This entry has been updated (OED Third Edition, March 2020; most recently modified version published online December 2021).

单词	ameiosis
释义	ameiosisn. Brit. /ˌeɪmʌɪˈəʊsɪs/, U.S. /ˌeɪˌmaɪˈoʊsəs/ Forms: see a- prefix⁶ and meiosis n. Origin: Formed within English, by derivation. Etymons: a- prefix⁶, meiosis n. Etymology: < a- prefix⁶ + meiosis n. (compare sense 3 at that entry). Compare earlier ameiotic adj. Biology. In meiosis: the production of diploid, rather than haploid, gametes.Haploid gametes are typically formed when one of the two nuclear divisions normally occurring in meiosis is absent. ΚΠ 1922 P. B. Sears in Bot. Gaz. 73 320 It seems, therefore, that the designation ‘ameiosis’, or ‘amiosis’, proposed by Sears in 1917..and indicating a type of maturation which obviates necessity for subsequent fertilization, is to be preferred to ‘homotypic mitosis’, a term of very explicit implications. 1943 L. W. Sharp Fund. Cytol. xiv. 206 Abnormal temperature, either high or low, may induce ameiosis in flower buds, so that diploid spores and gametes become available for crossing. 2014 Internat. Rev. Hydrobiol. 99 117 We tested effects on senescence of..female reproductive physiology (asexual females that reproduce by ameiosis, vs. sexual females reproducing by meiosis). This entry has been updated (OED Third Edition, March 2020; most recently modified version published online December 2021). < n.1922
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