| exoplasm | <biology> See Ectosarc, and Ectoplasm. Origin: Exo- + Gr. From, fr. To mold. Source: Websters Dictionary (01 Mar 1998) |
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| exopodite | <zoology> The external branch of the appendages of Crustacea. Origin: Exo- + Gr, foot. Source: Websters Dictionary (01 Mar 1998) |
| exoptile | <botany> A name given by Lestiboudois to dicotyledons; so called because the plumule is naked. Origin: F, fr.Gr. Without + feather, plumage. Source: Websters Dictionary (01 Mar 1998) |
| exorbitant | 1. Departing from an orbit or usual track; hence, deviating from the usual or due course; going beyond the appointed rules or established limits of right or propriety; excessive; extravagant; enormous; inordinate; as, exorbitant appetites and passions; exorbitant charges, demands, or claims. "Foul exorbitant desires." (Milton) 2. Not comprehended in a settled rule or method; anomalous. "The Jews . . . [were] inured with causes exorbitant, and such as their laws had not provided for." (Hooker) Origin: L. Exorbitans, -antis, p. Pr. Of exorbitare to go out of the track; ex out + orbita track: cf. F. Exorbitant. See Orbit. Source: Websters Dictionary (01 Mar 1998) |
| exordial | Pertaining to the exordium of a discourse: introductory. "The exordial paragraph of the second epistle." (I. Taylor) Source: Websters Dictionary (01 Mar 1998) |
| exorhiza | Origin: NL. Fr. Gr. Outside + root. <botany> A plant Whose radicle is not inclosed or sheathed by the cotyledons or plumule. Source: Websters Dictionary (01 Mar 1998) |
| exorhizous | <botany> Having a radicle which is not inclosed by the cotyledons or plumule; of or relating to an exorhiza. Source: Websters Dictionary (01 Mar 1998) |
| exoribonucleases | <enzyme> A family of enzymes that catalyze the exonucleolytic cleavage of RNA. Registry number: EC 3.1.- (12 Dec 1998) |
| exoserosis | Serous exudation from the skin surface, as in eczema or abrasions. (05 Mar 2000) |
| exoskeletal | <anatomy> Pertaining to the exoskeleton; as exoskeletal muscles. Source: Websters Dictionary (01 Mar 1998) |
| exoskeleton | <cell biology> A skeleton, or support structure, which supports the organisms body from the outside and is formed from the ectoderm. All arthropods (spiders, insects, crustaceans, horseshoe crabs, etc.) possess one. Compare: endoskeleton. Any structure that is formed from the ectoderm in vertebrates, like nails, claws, hair, fur, horns, or teeth. (Note: does not include skin, which is an organ.) (09 Oct 1997) |
| exosmose | <physics> The passage of gases, vapors, or liquids thought membranes or porous media from within outward, in the phenomena of osmose; opposed to endosmose. See Osmose. Origin: Exo+osmose: cf. F. Ezosmose. Source: Websters Dictionary (01 Mar 1998) |
| exosmosis | <physiology> The movement of liquid from inside the cell to the outside by osmosis through the cell membrane. Compare: endosmosis. (09 Oct 1997) |
| exospore | <biology> The extreme outer wall of a spore; the epispore. Origin: Exo+spote. Source: Websters Dictionary (01 Mar 1998) |
| exosporium | The outer envelope of a spore. (05 Mar 2000) |