| 释义 |
hypostome|ˈhɪpəʊstəʊm, ˈhaɪpəʊ-|
Also in L. form hyˈpostoma.
[ad. F. hypostome, mod.L. hypostoma, f. hypo- 2 + Gr. στόµα mouth.]
A part of the mouth in arthropods and some other invertebrate animals; e.g. the clypeus of dipterous insects, the labium or under lip of trilobites, the proboscis of Hydrozoa.
1862Dana Man. Geol. 188 note, Hypostome, a prominent piece on the under surface of the head, covering the mouth. 1872Nicholson Palæont. 147 The aperture of the mouth..bounded in front by a plate, known as the ‘labrum’ or ‘hypostoma’. 1888Rolleston & Jackson Anim. Life 246 The hypostome or oral cone [in hydranths] is conical. |