| 释义 |
petaloid, a.|ˈpɛtəlɔɪd|
[ad. mod.L. petaloideus, f. Gr. πέταλον, L. petal-um petal n.: see -oid: in mod.F. pétaloïde.]
1. Bot. Of the form of, or resembling, a petal: applied to parts or appendages of the flower when ‘coloured’ (i.e. not green) and of thin expanded form and delicate texture, like an ordinary petal.
1730Stack in Phil. Trans. XXXVI. 463 Where the Tube expanded itself, it divided into more than forty petaloid Segments. 1845Lindley Sch. Bot. iv. (1858) 25 Flowers unsymmetrical, with 2 petaloid and 3 herbaceous sepals. 1875Bennett & Dyer tr. Sachs' Bot. 470 The contrast of structure referred to is frequently wanting, both whorls being either sepaloid, as in Juncaceæ, or both petaloid, as in Lilium; in Helleborus, Aconitum, and some other species, the outer whorl or calyx alone is petaloid, the inner whorl or corolla being transformed into nectaries. 1882G. Allen in Nature 27 July 300/2 All stamens show a great tendency easily to become petaloid.
b. Belonging to the Petaloideæ, a division of Monocotyledons having normally flowers with ordinary coloured petals or petaloid parts, as lilies, orchids, etc. (not spadiceous, as arums, nor glumaceous, as grasses and sedges).
1836Penny Cycl. V. 248 Under the name of Asphodels he [Lobel] grouped the principal part of modern petaloid monocotyledons. 1872Oliver Elem. Bot. i. v. 58 Monocotyledons..with a perianth of petal-like leaves, hence called..Petaloid (Petaloideæ).
2. Zool. Applied to the ambulacra of certain Echinoids, which have a dilated portion and a tapering extremity, suggesting petals of a flower.
1862Dana Elem. Geol. 160 As this portion has..some resemblance to the petals of a flower, the ambulacra are then said to be petaloid. 1888Rolleston & Jackson Anim. Life 558 Fascioles surrounding the petaloid ambulacra.
So petaˈloidal a. (in quot. = sense 2); petaˈloideous a. = sense 1 b.
1872Nicholson Palæont. 109 Ambulacra composed of simple pores, not petaloidal. |