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/ˌästēˈikTHē-ēz/ Noun 1. A taxonomic group of fish that have bone, as opposed to cartilaginous, skeletons. The vast majority of fish are osteichthyes, which is an extremely diverse and abundant group consisting of 45 orders, and over 435 families and 28,000 species. It is the largest class of vertebrates in existence today. ( 2. A class of fish having a skeleton composed of bone in addition to cartilage. ( 3. Osteichthyes are a taxonomic superclass of fish, also called bony fish that includes the ray-finned fish (Actinopterygii) and lobe finned fish (Sarcopterygii). They are paraphyletic with land vertebrates, in some classification schemes the tetrapods et al are considered to be members of the osteichthyes for this reason. They are traditionally treated as a class of vertebrates, with subclasses Actinopterygii and Sarcopterygii, but some newer schemes divide them into several separate classes. The vast majority of fish are osteichthyes. Osteichthyes are the most various group of vertebrates, consisting of over 29,000 species, making them the largest class of vertebrates in existence today. ( Syn: Bony...

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/ˌästēˈäləjē/ Noun 1. a. The scientific study of bones, practiced by osteologists. A subdiscipline of anatomy, anthropology, and archeology, osteology is a detailed study of the structure of bones, skeletal elements, teeth, microbone morphology, function, disease, pathology, the process of ossification (from cartilaginous molds), the resistance and hardness of bones (biophysics), etc. often used by scientists with identification of vertebrate remains with regard to age, death, sex, growth, and development and can be used in a biocultural context. ( b. The scientific study of the morphology and pathology of bones. ( c. The medical study of diseases and disorders of bones. ( d. The study of the structure and function of the skeleton and bony structures. (Google Dictionary) 2. (Anatomy) The bone structure of a particular individual, or species. ( Word origin: from French ostèologie, from Modern Latin osteologia, from Greek osteon...

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1. The fundamental functional unit of compact bone. Osteons are roughly cylindrical structures that are typically several millimeters long and around 0.2mm in diameter. They are present in many bones of most mammals and some bird, reptile, and amphibian species. ( 2. Any of the central canals, and surrounding bony layers, found in compact bone. ( 3. A central canal containing blood capillaries and the concentric osseous lamellae around it occurring in compact bone. ( Syn: Haversian system Word origin: Before vowels oste-, word-forming element meaning “bone, bones,” from Greek osteon...

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/ˈästēəm/ Noun, pl. ostia 1. A small opening or orifice, as in a body organ or passage. ( 2. a. Any of the small openings or pores in a sponge. ( b. Each of a number of pores in the wall of a sponge, through which water is drawn in. (Google Dictionary) 3. A mouthlike opening in a bodily part (as a fallopian tube or a blood vessel)....

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