单词 | mamelon |
释义 | mamelonn. 1. A rounded eminence or hillock. ΘΚΠ the world > the earth > land > landscape > high land > rising ground or eminence > [noun] > hummock ground-wart1568 hub1669 mamelle1779 mamelon1830 hump1838 hummock1839 mammillation1849 1830 C. Lyell Princ. Geol. I. 206 This mammillon has been largely quarried for lime. 1848 D. Borrer Campaign Kabylie Upon the summit of two mammelons..two French outposts were placed. 1893 E. H. Barker Wanderings by S. Waters 289 An isolated hill or mamelon in the valley of the Lot. 1945 R. Hargreaves Enemy at Gate 217 The trench system on Janik Bair, and the mamelons in the neighbourhood of Krishin, formed the principal bastions. 1947 W. H. Auden in Amer. Scholar Autumn 404 Do they sponsor In us the mornes and motted mammelons? 2. A small rounded structure; esp. (a) Zoology the central knob of an echinoid tubercle; (b) Anatomy a prominence on the cutting edge of an incisor tooth. ΘΚΠ the world > health and disease > ill health > a disease > growth or excrescence > [noun] > tuber or tubercle tubercle1583 tuber1706 miliary tubercle1815 mamelon1860 1860 T. H. Huxley in Trans. Linn. Soc. 23 245 The ‘mamelon’ is a structure homologous with the cyathozooid of the fœtal Pyrosoma. 1872 H. A. Nicholson Man. Palæontol. 105 Ordinarily the tubercle consists of a rounded ball or hemisphere (the ‘mamelon’). 1946 H. Woods Palæontol. Invertebr. (ed. 8) 137 In a primary tubercle the following parts may be distinguished: at the summit a hemispheroidal piece, sometimes perforated at the top, and known as the mamelon. 1962 D. Nichols Echinoderms viii. 99 Each tubercle consisting of a central boss and saucer-like mamelon, to which the spine muscles are attached. 1969 W. A. S. Sarjeant in G. Erdtman Handbk. Palynol. 190 A mamelon with a central perforation. 1983 Jrnl. Amer. Dental Assoc. 107 63/1 The presence of mamelons on newly erupted permanent incisors has long been known, but their incidence, number, and morphology have received scant attention. This entry has been updated (OED Third Edition, June 2000; most recently modified version published online March 2022). < |
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