megasporangiumn.

Brit.

/ˌmɛɡəspəˈran(d)ʒɪəm/, U.S.

/ˌmɛɡəspəˈrændʒiəm/

Inflections: Plural megasporangia.

Origin: Formed within English, by compounding. Etymons: mega- comb. form, sporangium n.

Etymology: < mega- comb. form + sporangium n., after megaspore n. Compare earlier macrosporangium n.

Botany.

A sporangium containing megaspores; the part of a plant in which the female gametophyte is formed.

ΘΚΠ

the world > plants > particular plants > moss > [noun] > club-moss or moss-like ferns > parts of

powder1672

oophoridium1847

oophorid1848

oosporangium1857

macrosporangium1862

rhizophore1875

megasporangium1886

megasporange1889

protophyll1891

prophyll1971

1886 Athenæum 10 Apr. 491/2 Mr. Bennett has made use of the term Megasporangia in describing the heterosporous vascular cryptogams.

1939 Bot. Rev. 5 114 The surfaces of these placentae..are sporogenous, and from them arise nucelli which are merely specialized regions of the megasporangium.

1969 F. E. Round Introd. Lower Plants xi. 133 All the leaves [of Isoetes] are potentially fertile and megasporangia form in the outer leaves and microsporangia in the inner.

1992 M. Ingrouille Diversity & Evol. Land Plants 110 An ovule is the megasporangium of seed plants containing a single megaspore surrounded by an extra structure, the integument.

This entry has been updated (OED Third Edition, June 2001; most recently modified version published online March 2022).

单词	megasporangium
释义	megasporangiumn. Brit. /ˌmɛɡəspəˈran(d)ʒɪəm/, U.S. /ˌmɛɡəspəˈrændʒiəm/ Inflections: Plural megasporangia. Origin: Formed within English, by compounding. Etymons: mega- comb. form, sporangium n. Etymology: < mega- comb. form + sporangium n., after megaspore n. Compare earlier macrosporangium n. Botany. A sporangium containing megaspores; the part of a plant in which the female gametophyte is formed. ΘΚΠ the world > plants > particular plants > moss > [noun] > club-moss or moss-like ferns > parts of powder1672 oophoridium1847 oophorid1848 oosporangium1857 macrosporangium1862 rhizophore1875 megasporangium1886 megasporange1889 protophyll1891 prophyll1971 1886 Athenæum 10 Apr. 491/2 Mr. Bennett has made use of the term Megasporangia in describing the heterosporous vascular cryptogams. 1939 Bot. Rev. 5 114 The surfaces of these placentae..are sporogenous, and from them arise nucelli which are merely specialized regions of the megasporangium. 1969 F. E. Round Introd. Lower Plants xi. 133 All the leaves [of Isoetes] are potentially fertile and megasporangia form in the outer leaves and microsporangia in the inner. 1992 M. Ingrouille Diversity & Evol. Land Plants 110 An ovule is the megasporangium of seed plants containing a single megaspore surrounded by an extra structure, the integument. This entry has been updated (OED Third Edition, June 2001; most recently modified version published online March 2022). < n.1886
随便看	toppingout ceremony toppings toppish topple touch warden touch watch touch well touch wood touch writer touch-controlled touch-dance touch-dry touch-finder touch-finding touch-hole touch-in-goal touch-in-goal line touch-kick touch-knowledge touch-last touch-me-not touch-me-not-ish touch-me-not-ishness touch-no-walls touch-operated