| 释义 |
aboral, a. Zool.|æˈbɔərəl|
[f. L. ab away from + -oral, f. L. ōr- mouth.]
Pertaining to the region of the animal body at the opposite extremity from the mouth. Used especially of those types of animal structure in which the mouth occupies one of the poles.
1857L. Agassiz Contrib. Nat. Hist. N. America IV. 376 I have called this side [of radiate animals] the oral or actinal area, and the opposite side the aboral or abactinal area. 1878Macalister Invertebr. 56 The intestine..ends in a small aboral sac or cloaca.
Add: Hence aˈborally adv., in an aboral position or direction.
1883Jrnl. Linn. Soc. XVI. 228 Mouth-plates rather broad, prominent aborally, having 5 or 6 short mouth-spines attached to the lateral aliform extensions, and directed horizontally. 1903Proc. R. Soc. LXXI. 117 Sources of aborally-running fibre-systems. 1910Encycl. Brit. VII. 675/1 The shell is similar to that of Loligo, but ends aborally in a little hollow cone. 1974Nature 8 Feb. 395/2 The arms were always seen to recurve aborally through almost 270°. 1992Age & Ageing XXI. 1/1 Under normal conditions, the major factor that limits the concentration of bacteria in the upper small intestine is intestinal motility, sweeping gut contents aborally. |