| AKOLUTHOSES | • AKOLUTHOS n. (historical) the head of the Varangian guard of the Byzantine emperors, also ACOLOUTHOS, AKOLOUTHOS. |
| ANORTHOSITE | • anorthosite n. (Petrology) A phaneritic, intrusive igneous rock characterized by a predominance of plagioclase feldspar. • ANORTHOSITE n. an igneous rock that consists of 90 or more percent of plagioclase feldspar, typically labradorite. |
| BENTHOSCOPE | • BENTHOSCOPE n. a submersible sphere from which to study deep-sea life. |
| FELSPATHOSE | • FELSPATHOSE adj. of or like felspar, also FELDSPATHIC, FELDSPATHOSE, FELSPATHIC. |
| GNATHOSTOME | • gnathostome n. (Zoology) Any vertebrate with jaws, including amphibians, reptiles, mammals, and most modern fish, in… • GNATHOSTOME n. any vertebrate of the superclass Gnathostomata, having a mouth with jaws, including all vertebrates except the agnathans. |
| LITHOSPHERE | • lithosphere n. (Geology) The rigid, mechanically strong, outer layer of the Earth; divided into twelve major plates. • LITHOSPHERE n. the solid outer portion of the Earth consisting of the crust and upper mantle, approximately 100 km (62 miles) thick. |
| LITHOSTATIC | • lithostatic adj. (Geology) Describing the static pressure maintained by a weight of rock; geostatic. • LITHOSTATIC adj. relating to the pressure or stress imposed on a layer of soil or rock by the weight of overlying material. |
| MESOBENTHOS | • MESOBENTHOS n. flora and fauna living at the bottom of seas 182 to 914 metres deep. |
| OPISTHOSOMA | • opisthosoma n. (Zoology) The posterior abdomen of the chelicerates. • OPISTHOSOMA n. the abdomen of a spider or other arachnid. |
| ORNITHOSAUR | • ORNITHOSAUR n. a pterodactyl. |
| ORTHOSCOPES | • orthoscopes n. Plural of orthoscope. • ORTHOSCOPE n. a nineteenth century instrument for viewing the fundus of the eye through a layer of water, which eliminates distortion caused by the cornea. |
| ORTHOSCOPIC | • orthoscopic adj. Free from optical distortion. • ORTHOSCOPIC adj. giving undistorted vision. |
| ORTHOSTATIC | • orthostatic adj. Relating to orthostasis or orthostatism. • orthostatic adj. (Archaeology) Relating to an orthostat. • ORTHOSTATIC adj. pertaining to erect or standing position. |
| ORTHOSTICHY | • orthostichy n. (Botany) A row of leaves along a stem. • ORTHOSTICHY n. a straight row, e.g. of leaves vertically over one another on an axis. |
| PHOTOLITHOS | • PHOTOLITHO n. (short for) a photolithograph. |
| STETHOSCOPE | • stethoscope n. (Medicine) A medical instrument used for listening to sounds produced within the body. • stethoscope v. (Transitive) To auscultate, or examine, with a stethoscope. • STETHOSCOPE n. an instrument with which to listen to the sounds produced by the heart, lungs, etc. |
| STETHOSCOPY | • stethoscopy n. (Medicine) The diagnostic use of a stethoscope. • STETHOSCOPY n. examination with a stethoscope. |