| 释义 |
deltoid, a. (n.)|ˈdɛltɔɪd|
[mod. a. Gr. δελτοειδής delta-shaped, triangular: see -oid. So F. deltoide (in Paré, 16th c.); mod.L. deltoides (Linnæus), and deltoideus.]
1. Resembling the Greek letter Δ in shape; triangular; esp. in Bot., of a leaf; also triangular in section, as the leaf of Mesembryanthemum deltoideum; also in comb., as deltoid-ovate, of an ovate outline but somewhat deltoid; so deltoid-hastate, etc.
1753Chambers Cycl. Supp. s.v. Leaf, Deltoide Leaf. 1793Martyn Lang. Bot. s.v., A leaf of the common Black Poplar..is given as an instance of a deltoid leaf in Linnæus's specific characters. 1845Lindley Sch. Bot. vii. (1858) 122 Leaves ovate, acute, somewhat deltoid. 1870Hooker Stud. Flora 240 Cicendia..calyx campanulate, teeth deltoid.
b. deltoid muscle (Anat.): the large muscle of triangular shape which forms the prominence of the shoulder; it serves to raise the arm and draw it from the body. deltoid ligament: see quot. 1835.
1741Monro Anat. (ed. 3) 237 Some Part of the deltoid Muscle. 1835–6Todd Cycl. Anat. I. 152 The internal tibio⁓tarsal ligament, is also called the internal lateral, and by Weithecht, the deltoid ligament. 1877Rosenthal Muscles & Nerves 92 The elevator of the upper arm, which on account of its triangular shape is called the deltoid muscle.
c. Entom. deltoid moth: a moth which in repose spreads its wings over the back in a triangular form; also absol.
1859H. T. Stainton Manual Brit. Butterflies & Moths II. 125 Deltoides, these insects form a sort of connecting group between the Noctuæ and the true Pyralidæ.. Any one who has seen that insect in repose will recognize the resemblance in the form of the wings to the Greek Delta, Δ, whence the name. 1869E. Newman Brit. Moths Pref. 3 It was intended to include the Deltoids, Pyrales, Veneers, and Plumes.
2. Of the nature of the delta of a river.
1837Penny Cycl. VIII. 376/1 The whole of Holland is a formation of deltoid islands, created by the anastomosing branches of the Rhine, the Meuse, and the Scheldt. The deltoid form of the mouths of the Petchora is no longer recognizable in the group of islands at its embouchure. 1861Darwin in Life & Lett. (1887) II. 364 The French superficial deposits are deltoid and semi-marine.
B. n.
1. The deltoid muscle. Also in L. form deltoīdes, deltoīdeus.
[1681tr. Willis' Rem. Med. Wks. Vocab., Deltoides, a muscle in the top of the arm, having the figure of a Delta, the Greek D.] 1758J. S. Le Dran's Observ. Surg. (1771) 149 The Deltoid was elevated by it and much tumified. 1860O. W. Holmes Elsie V. iii. (1891) 32 The deltoid, which caps the shoulder like an epaulette.
attrib.1881Mivart Cat 91 External to this is a slightly roughened and elevated tract called the deltoid ridge.
2. (See quot.)
1879Rossiter Dict. Sci. Terms, Deltoid, a four-sided figure formed of two unequal isosceles triangles on opposite sides of a common base.
3. A deltoid moth: see A. 1 c. |