| ASTROBIOLOGISTS | • astrobiologists n. Plural of astrobiologist. • ASTROBIOLOGIST n. one who studies astrobiology. |
| BASIDIOSPOROUS | • BASIDIOSPOROUS adj. of or like a basidiospore, a spore produced by a basidium. |
| BOOKCROSSINGS | • bookcrossings n. Plural of bookcrossing. • BOOKCROSSING n. the practice of leaving a book in a public location to be found and read by others, who then do the same. |
| BOSSYBOOTS | • bossyboots n. (Informal) A bossy person. • BOSSYBOOTS n. (colloquial) a bossy person. |
| BRONCHOSCOPISTS | • bronchoscopists n. Plural of bronchoscopist. • BRONCHOSCOPIST n. one who uses a bronchoscope, an instrument for examining the windpipe. |
| CONTRABASSOONS | • contrabassoons n. Plural of contrabassoon. • CONTRABASSOON n. a musical instrument playing an octave below the bassoon. |
| NONOBVIOUSNESS | • nonobviousness n. The state or condition of being nonobvious. |
| OBNOXIOUSNESS | • obnoxiousness n. The characteristic of being obnoxious. • OBNOXIOUSNESS n. the state of being obnoxious. |
| OBNOXIOUSNESSES | • obnoxiousnesses n. Plural of obnoxiousness. • OBNOXIOUSNESS n. the state of being obnoxious. |
| OPPROBRIOUSNESS | • opprobriousness n. The state or condition of being opprobrious. • OPPROBRIOUS n. expressing contemptuous reproach; bringing disgrace. |
| OSSOBUCOS | • OSSOBUCO n. (Italian) an Italian dish of veal knuckle cooked with the bone and stewed in wine, herbs etc. |
| OSTEOFIBROSES | • OSTEOFIBROSIS n. fibrosis of the bone. |
| OSTEOFIBROSIS | • osteofibrosis n. Fibrotic osteodystrophy. • OSTEOFIBROSIS n. fibrosis of the bone. |
| SNOWBOARDCROSS | • snowboardcross n. Alternative spelling of snowboard cross. • snowboard␣cross n. (Snowboarding) A downhill snowboard race over obstacles with many simultaneous racers. |
| SOCIOBIOLOGISTS | • sociobiologists n. Plural of sociobiologist. • SOCIOBIOLOGIST n. one who studies sociobiology. |
| STROBOSCOPES | • stroboscopes n. Plural of stroboscope. • STROBOSCOPE n. an instrument for studying motion using flashes of light. |