invertebrate

n, adj (animal) not having a backbone or spinal column 无脊椎的（动物）: Molluscs, insects and worms are all invertebrates. 软体动物、 昆虫、 蠕虫都是无脊椎动物.

invalidity, invaluable, invariability, invariable, invariably, invariance, invasion, invasive, invective, inveigh, inveigle, invent, invention, inventive, inventor, inventory, inverse, inversely, inversion, invert, inverted, inverted commas, inverted snob, invest, investigate, investigation, investigative, investigator, investiture, investment, investor, inveterate, inveterately, invidious, invidiously, invidiousness, invigilate, invigilation, invigilator, invigorate,