Precambrian

or Pre-Cam·bri·an

[ pree-kam-bree-uh n, -keym- ]
/ priˈkæm bri ən, -ˈkeɪm- /
Geology

adjective

noting or pertaining to the earliest era of earth history, ending 570 million years ago, during which the earth's crust formed and life first appeared in the seas.

noun

the Precambrian Era.

QUIZZES

CHALLENGE YOURSELF WITH THIS MIDDLE SCHOOL PART OF SPEECH QUIZ!

How well do you know your adjectives from your adverbs? Your preposition from your pronouns? Your interjections from your conjunctions? Let’s put your knowledge of parts of speech to the text! Note: Many of the following questions will ask you to identify the parts of speech “in order.” That means the first word in all capital letters will correspond to the first option in an answer, and so on.
Question 1 of 10
In order, what parts of speech are the words in all capital letters? Alisa was VERY tired, SO she decided to go to bed.

Origin of Precambrian

First recorded in 1860–65; pre- + Cambrian
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for precambrian

British Dictionary definitions for precambrian

Precambrian

Pre-Cambrian

/ (priːˈkæmbrɪən) /

adjective

of, denoting, or formed in the earliest geological era, which lasted for about 4 000 000 000 years before the Cambrian period

noun

the Precambrian the Precambrian eraSee Archaeozoic, Proterozoic
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for precambrian

Precambrian
[ prē-kămbrē-ən, -kām- ]

The period of geologic time between Hadean Time and the Phanerozoic Eon, from about 3.8 billion to 540 million years ago. During the Precambrian Eon, which is divided into the Archean and Proterozoic, primitive forms of life first appeared on Earth. See Chart at geologic time.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.