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/am-byuh-lak-ruhm, -ley-kruhm/ Noun, pl. ambulacra 1. (in a starfish or other echinoderm) Each of the radially arranged bands, together with their underlying structures, through which the double rows of tube feet protrude. (Google Dictionary) 2. This term refers to echinoderm’s five part radial areas (undersurfaced side) from where the tube feet protrude as well as withdraw. (   Word origin: New Latin, from Latin, alley, from ambulare to walk —...

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/ˈamnēˌōt/ Noun, pl. amniotes 1. A group of tetrapods (four-limbed animals with backbones or spinal columns) that have an egg equipped with an amnios, an adaptation to lay eggs on land rather than in water as anamniotes do. ( 2. Any of the Amniota group of vertebrates having an amnion during the development of the embryo; mammals, birds and reptiles. ( 3. An animal whose embryo develops in an amnion and chorion and has an allantois; a mammal, bird, or reptile. (Google...

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/əˈmiː.bə.saɪt/ Noun, pl. amoebocytes 1. A mobile cell (moving like an amoeba) in the body of invertebrates such as echinoderms, mollusks or sponges. They move by pseudopodia. Similarly to some of the white blood cells of vertebrates, in many species amebocytes are found in the blood or body fluid and play a role in the defense of the organism against pathogens. Depending on the species, it may also digest and distribute food, dispose of wastes, form skeletal fibers, fight infections, and change into other cell types. ( 2. Also known as explosive cells ( 3. Phagocytic cell found circulating in the body cavity of coelomates (particularly annelids and molluscs) or crawling through the interstitial tissues of sponges. A fairly noncommittal classification. ( Also, amœbocyte and...

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