Arcella
a genus of freshwater, ameboid protozoa that secrete a hard, umbrellalike shell having a single opening through which the pseudopodia extend.
Historical Examples
Dujardin points out very clearly the identity of structure between organisms like Amœbæ and such forms as Difflugia and Arcella.
The Ocean World: Louis Figuier
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Geometry. any unbroken part of the circumference of a circle or other curved line. Also called electric arc. Electricity. a luminous bridge formed in a gap between two electrodes. Compare 1 (def 2). Astronomy. the part of a circle representing the apparent course of a heavenly body. anything bow-shaped. to form an . to move […]
- Arcesilaus
316–241 b.c, Greek philosopher. Historical Examples Arcesilaus attacked especially their doctrine of the criterion of truth. A Critical History of Greek Philosophy W. T. Stace Seneca is of opinion, that he was suspected to be as much given to wine as Arcesilaus. Ebrietatis Encomium Boniface Oinophilus The same thing, but not designed by him, despatched […]
- Arcesius
a son of Zeus and Euryodia, father of Laertes, and grandfather of Odysseus.
- Archaea
. archaeon (är’kē-ŏn’) Plural archaea Any of a group of microorganisms that resemble bacteria but are different from them in certain aspects of their chemical structure, such as the composition of their cell walls. Archaea usually live in extreme, often very hot or salty environments, such as hot mineral springs or deep-sea hydrothermal vents, but […]
- Archangel
Theology. a chief or principal angel; in medieval angelology one of the nine orders of celestial attendants on God. Compare (def 1). (def 1). Russian Arkhangelsk. a seaport in the NW Russian Federation in Europe, on Dvina Bay. Gulf of, former name of . Contemporary Examples Religion, mythology, and history were plundered for nouns; hence, […]