Quaternary definitions Webster's 1828 Dictionary QUATERN'ARY, n. [L. quaternarius ... or especially arranged in sets of four; "quaternate leaves"; "a quaternary compound" [syn: quaternate, quaternary] 2: coming next after the third and just before the ... fifth in position or time or degree or magnitude; "the quaternary period of geologic time extends from the end of the tertiary period to the present" [syn: fourth, 4th, quaternary] n 1: last 2 million years [syn: Quaternary, Quaternary period, Age of Man] 2: the cardinal number ...
Quaternary period definitions WordNet (r) 3.0 (2005) n 1: last 2 million years [syn: Quaternary, Quaternary period, Age of Man] Britannica Concise Interval of geologic time, 1.6 million years ago to the present. The Quaternary follows the Tertiary period and is the more recent of the two periods of the Cenozoic era. The Quaternary is subdivided into the Pleistocene epoch and the Holocene epoch ... humans. The dramatic changes of climate and environment in the Quaternary led to high rates of evolution and extinction, particularly ...
... limestone (C), and the last by Tertiary deposits (T). The Quaternary, or Recent, deposits (R) and also the Eruptive rocks (E ... relations to any particular ones of the other formations. The Quaternary follows the great rivers and the seacoasts. The Eruptive rocks ... Tertiary areas were lifted out of the sea. During the Quaternary period the Nile and the rivers of Mesopotamia have added ... were being laid down to form these Tertiary strata. 7. Quaternary and Recent Strata (R): These consist mainly of the superficial ...
... or especially arranged in sets of four; "quaternate leaves"; "a quaternary compound" [syn: quaternate, quaternary] Webster's 1913 Dictionary Quaternate Qua*ter"nate, a. Composed of, or arranged in, sets of four; quaternary; as, quaternate leaves.
... three and one [syn: four, 4, IV, tetrad, quatern, quaternion, quaternary, quaternity, quartet, quadruplet, foursome, Little Joe] Merriam Webster's noun ... satisfy certain conditions. Etymology: ME f. LL quaternio -onis (as QUATERNARY) Webster's 1913 Dictionary Quaternion Qua*ter"ni*on, n. [L. quaternio, fr. quaterni four each. See Quaternary.] 1. The number four. [Poetic] 2. A set of four ...
... solution as a herbicide Merriam Webster's noun Etymology: para- + quaternary Date: circa 1961 a highly toxic contact herbicide containing a ... becoming inactive on contact with the soil. Etymology: PARA-(1) + QUATERNARY (from the position of the bond between the two parts of the molecule relative to quaternary nitrogen atom) Collin's Cobuild Dictionary Paraquat is a very ...
... Geol. a time forming part of a geological era (the Quaternary period). 4 a an interval between recurrences of an astronomical ... Mississippian, Oligocene, Paleocene, Paleozoic, Pennsylvanian, Permian, Pleistocene, Pliocene, Precambrian, Proterozoic, Quaternary, Recent, Silurian, Tertiary, Triassic, Upper Cretaceous, Upper Tertiary, Z, accent ...
... time, including the tertiary, or Age of mammals, and the Quaternary, or Age of man. [Written also c[ae]nozoic, cainozoic ... is used by many authors as synonymous with Tertiary, the Quaternary Age not being included.
... time, including the tertiary, or Age of mammals, and the Quaternary, or Age of man. [Written also c[ae]nozoic, cainozoic ... is used by many authors as synonymous with Tertiary, the Quaternary Age not being included.
... time, including the tertiary, or Age of mammals, and the Quaternary, or Age of man. [Written also c[ae]nozoic, cainozoic ... is used by many authors as synonymous with Tertiary, the Quaternary Age not being included.
... fifth in position or time or degree or magnitude; "the quaternary period of geologic time extends from the end of the tertiary period to the present" [syn: fourth, 4th, quaternary]