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Science; General science
A natural or artificial conveyance through which liquid (typically water) having a free surface moves. The free surface is the interface with a gas (usually the atmosphere), along ...
araneae
Science; General science
A natural order of the class Arachnida, also called Araneida, commonly known as the spiders. These animals are widespread over most of the land areas of the world and are well ...
biology
Science; General science
A natural science concerned with the study of all living organisms. Although living organisms share some unifying themes, such as their origin from the same basic cellular ...
geyser
Science; General science
A natural spring or fountain which discharges a column of water or steam into the air at more or less regular intervals. It may be regarded as a special type of spring. Perhaps ...
river
Science; General science
A natural, fresh-water surface stream that has considerable volume compared with its smaller tributaries. The tributaries are known as brooks, creeks, branches, or forks. Rivers ...
coesite
Science; General science
A naturally occurring mineral of wide interest, the high-pressure polymorph of SiO 2 . Coesite was first discovered and identified in various meteorite impact craters and in some ...
acetylcholine
Science; General science
A naturally occurring quaternary ammonium cation ester, with the formula CH 3 (O)COC 2 H 4 N(CH 3 ) 3 + , that plays a prominent role in nervous system function.
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