ameristicadj.

Brit.

/ˌaməˈrɪstɪk/, U.S.

/ˌæməˈrɪstɪk/

Origin: A borrowing from Greek, combined with English elements. Etymons: a- prefix⁶, Greek μεριστός , -ic suffix.

Etymology: < a- prefix⁶ + ancient Greek μεριστός divided, divisible (see meristic adj.) + -ic suffix. In sense 1 after meristem n. In sense 2 after German ameristisch (K. Prantl 1878, in Flora 61 499); compare earlier meristem n.

1. Botany. Of a gametophyte of a fern: that lacks a meristem, and is capable of producing antheridia only. Contrasted with meristic adj. 3.

ΚΠ

1879 Jrnl. Royal Microsc. Soc. 2 317 The antheridia of ferns..may spring from any of the older cells, and may consequently occur on ameristic prothallia.

1911 Science 3 Feb. 192/1 Spores of the same species, which formed at first narrow ameristic plants bearing antheridia, subsequently developed heart-shaped proliferations at their apices bearing archegonia.

1978 Canad. Jrnl. Bot. 56 1594/1 Antheridia were found on small ameristic gametophytes and on lobes of old, large, abundantly branched gametophytes.

2012 Internat. Jrnl. Plant Sci. 173 382 Antheridiogen sytems, whereby notch-bearing, archegoniate gametophytes induce maleness in ameristic neighbors, have been detected in many core leptosporangiate ferns.

†2. Biology. Of an organism: lacking segmentation of the body; not metameric. Cf. meristic adj. 2. Obsolete. rare.

ΚΠ

1881 E. R. Lankester in Encycl. Brit. XII. 555/1 In dysmerogenesis, the form which individuation tends to preserve is that of the primary unit (notably the case in leeches as compared with the ameristic flukes).

This entry has been updated (OED Third Edition, September 2020; most recently modified version published online June 2022).

单词	ameristic
释义	ameristicadj. Brit. /ˌaməˈrɪstɪk/, U.S. /ˌæməˈrɪstɪk/ Origin: A borrowing from Greek, combined with English elements. Etymons: a- prefix⁶, Greek μεριστός , -ic suffix. Etymology: < a- prefix⁶ + ancient Greek μεριστός divided, divisible (see meristic adj.) + -ic suffix. In sense 1 after meristem n. In sense 2 after German ameristisch (K. Prantl 1878, in Flora 61 499); compare earlier meristem n. 1. Botany. Of a gametophyte of a fern: that lacks a meristem, and is capable of producing antheridia only. Contrasted with meristic adj. 3. ΚΠ 1879 Jrnl. Royal Microsc. Soc. 2 317 The antheridia of ferns..may spring from any of the older cells, and may consequently occur on ameristic prothallia. 1911 Science 3 Feb. 192/1 Spores of the same species, which formed at first narrow ameristic plants bearing antheridia, subsequently developed heart-shaped proliferations at their apices bearing archegonia. 1978 Canad. Jrnl. Bot. 56 1594/1 Antheridia were found on small ameristic gametophytes and on lobes of old, large, abundantly branched gametophytes. 2012 Internat. Jrnl. Plant Sci. 173 382 Antheridiogen sytems, whereby notch-bearing, archegoniate gametophytes induce maleness in ameristic neighbors, have been detected in many core leptosporangiate ferns. †2. Biology. Of an organism: lacking segmentation of the body; not metameric. Cf. meristic adj. 2. Obsolete. rare. ΚΠ 1881 E. R. Lankester in Encycl. Brit. XII. 555/1 In dysmerogenesis, the form which individuation tends to preserve is that of the primary unit (notably the case in leeches as compared with the ameristic flukes). This entry has been updated (OED Third Edition, September 2020; most recently modified version published online June 2022). < adj.1879
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