| HEORTOLOGY | • heortology n. The study of religious festivals. • HEORTOLOGY n. the study of religious feasts. |
| HOMOEROTIC | • homoerotic adj. Arousing a homosexual desire. • homoerotic adj. Pertaining to homosexual love or desire. • homoerotic adj. Homosexual. |
| MOTHERHOOD | • motherhood n. The state of being a mother. • motherhood n. Mothers, considered as a group. • MOTHERHOOD n. the state of being a mother. |
| MOTORHOMES | • motorhomes n. Plural of motorhome. • motor-homes n. Plural of motor-home. • motor␣homes n. Plural of motor home. |
| OCTOHEDRON | • octohedron n. Alternative form of octahedron. • OCTOHEDRON n. (Greek) a solid bounded by eight plane faces, also OCTAHEDRON. |
| OCTOTHORPE | • octothorpe n. (Chiefly US, typography) The hash or square symbol (#), used mainly in telephony and computing. |
| ORTHODOXES | • Orthodoxes n. Plural of Orthodox. • ORTHODOX n. an orthodox person. |
| ORTHOPNOEA | • orthopnoea n. Shortness of breath when lying flat, causing the person to have to sleep propped up in bed or sitting in a chair. • orthopnœa n. Obsolete spelling of orthopnoea. • ORTHOPNOEA n. the ability to breathe in an upright position only. |
| ORTHOSCOPE | • orthoscope n. An instrument for examining the interior of an eye. • orthoscope n. An instrument for drawing projections of a skull. • 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. |
| ORTHOTONES | • ORTHOTONE n. an orthotone word. |
| OTORRHOEAS | • otorrhoeas n. Plural of otorrhoea. • OTORRHOEA n. a discharge from the ear. |
| OVERSHOOTS | • overshoots v. Third-person singular simple present indicative form of overshoot. • OVERSHOOT v. to shoot over or beyond one's target. |
| PHOTOPHORE | • photophore n. (Biology) A light-emitting organ, found in some fish and other marine animals. • photophore n. (Medicine) A form of endoscope using an electric light. • PHOTOPHORE n. a luminiferous organ. |
| PHOTOTROPE | • PHOTOTROPE n. a substance exhibiting phototropism, movement directed by light. |
| SMOOTHBORE | • smoothbore adj. (Firearms) having a bore with a smooth interior, ie. one that has not been rifled. • smoothbore n. (Firearms) a cannon, gun or other firearm that has an unrifled barrel. • SMOOTHBORE adj. having a bore of perfectly smooth surface, not rifled. |
| TOCOPHEROL | • tocopherol n. (Biochemistry) Any of several isomers of the principal component of vitamin E, each containing a chromanol… • TOCOPHEROL n. vitamin E, found in wheatgerm, egg yolk etc. |
| TOOLHOLDER | • toolholder n. Part of a machine that grips a replaceable tool. • TOOLHOLDER n. a holder for tools. |