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proterozoic
Science; General science
A major division of geologic time spanning from 2500 to 543 million years before present (Ma). The beginning of Proterozoic time is an arbitrary boundary that roughly coincides ...
pennsylvanian
Science; General science
A major division of late Paleozoic time, considered either as an independent period or as the younger subperiod of the Carboniferous. In North America, the Pennsylvanian has been ...
bilateria
Science; General science
A major division of the animal kingdom comprising all forms with a bilaterally symmetrical body plan (that is, their left and right sides are mirror images, or nearly so) and ...
deuterostomia
Science; General science
A major division of the animal kingdom comprising the phyla Hemichordata, Echinodermata, and Chordata. Hemichordata consists of acorn worms (Enteropneusta) and a group of ...
paleozoic
Science; General science
A major division of time in geologic history, extending from about 540 to 250 million years ago (Ma). It is the earliest era in which significant numbers of shelly fossils are ...
ecdysozoa
Science; General science
A major division within the animal kingdom containing the majority of animal species and comprising the phyla Priapulida, Kinorhyncha, and Loricifera (no common names), Arthropoda ...
meningococcus
Science; General science
A major human pathogen belonging to the bacterial genus Neisseria , and the cause of meningococcal meningitis and meningococcemia. The official designation is N. meningitidis .
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