| ANOESTROUS | • ANOESTROUS adj. relating to anoestrus, a period of sexual in activity between periods of oestrus. |
| AUTOSPORES | • autospores n. Plural of autospore. • AUTOSPORE n. a nonmotile algal spore. |
| AUXOSPORES | • auxospores n. Plural of auxospore. • AUXOSPORE n. a diatom cell before its siliceous wall is formed. |
| BOATHOUSES | • boathouses n. Plural of boathouse. • BOATHOUSE n. a place for keeping boats. |
| COALHOUSES | • coalhouses n. Plural of coalhouse. • COALHOUSE n. a place where coal is kept. |
| HOUSEBOATS | • houseboats n. Plural of houseboat. • HOUSEBOAT n. a boat moored and used as a permanent residence. |
| HOUSECOATS | • housecoats n. Plural of housecoat. • house-coats n. Plural of house-coat. • HOUSECOAT n. a woman's usually long coat-like dressing-gown, worn at home. |
| IONOPAUSES | • ionopauses n. Plural of ionopause. • IONOPAUSE n. the region of the earth's atmosphere at the outer limit of the ionosphere. |
| NONGASEOUS | • nongaseous adj. Not gaseous. • NONGASEOUS adj. not gaseous. |
| OASTHOUSES | • oasthouses n. Plural of oasthouse. • oast␣houses n. Plural of oast house. • OASTHOUSE n. a house where hops are dried. |
| OESOPHAGUS | • oesophagus n. (Anatomy) The tube that carries food from the pharynx to the stomach. • œsophagus n. (Chiefly British spelling) Obsolete form of oesophagus. • OESOPHAGUS n. that portion of the gut which connects the pharynx to the stomach, also ESOPHAGUS. |
| OSTRACEOUS | • ostraceous adj. Resembling or characteristic of an oyster. • OSTRACEOUS adj. of or relating to oysters, also OSTRACEAN. |
| OUTREASONS | • outreasons v. Third-person singular simple present indicative form of outreason. • OUTREASON v. to surpass in reasoning. |
| ROADHOUSES | • roadhouses n. Plural of roadhouse. • ROADHOUSE n. a roadside public house. |
| SOUSAPHONE | • sousaphone n. A valved brass instrument with the same length as a tuba, but shaped differently so that the bell is… • SOUSAPHONE n. a musical instrument similar to a tuba. |
| TREASONOUS | • treasonous adj. Like or in the way of treason. • TREASONOUS adj. treasonable. |