| AEROBIONTS | • aerobionts n. Plural of aerobiont. • AEROBIONT n. an aerobe, an organism requiring oxygen to survive. |
| AEROLOGIST | • aerologist n. One who studies, or is knowledgable in, aerology. • AEROLOGIST n. one versed in aerology. |
| AERONOMIST | • aeronomist n. One who studies aeronomy. • AERONOMIST n. one who studies aeronomy, the science of the earth's atmosphere, also AERONOMER. |
| DONATORIES | • donatories n. Plural of donatory. • DONATORY n. a donee of the crown; one to whom, upon certain condition, escheated property is made over, also DONATARY. |
| ESOTROPIAS | • esotropias n. Plural of esotropia. • ESOTROPIA n. a condition in which the eye turns inwards. |
| EXORATIONS | • exorations n. Plural of exoration. • EXORATION n. (obsolete) entreaty. |
| EXOTROPIAS | • exotropias n. Plural of exotropia. • EXOTROPIA n. a condition in which the eyes turn outwards. |
| OCTONARIES | • octonaries n. Plural of octonary. • OCTONARY n. a stanza of eight lines. |
| OESTRADIOL | • oestradiol n. (British spelling) Alternative spelling of estradiol. • OESTRADIOL n. a natural oestrogen also synthesised for use in cancer treatment. |
| OPERATIONS | • operations n. Plural of operation. • OPERATION n. the act of operating. |
| OSTENSORIA | • ostensoria n. Plural of ostensorium. • OSTENSORIUM n. a monstrance (a receptacle for the Eucharist). |
| PROPOSITAE | • propositae n. Plural of proposita. • PROPOSITA n. a woman from whom a line of descent is traced. |
| REBOATIONS | • reboations n. Plural of reboation. • REBOATION n. being reboant, reverberation. |
| RESONATION | • resonation n. The act or state of resonating. • RESONATION n. the act of resonating. |
| WATERZOOIS | • WATERZOOI n. a stew of fish or chicken and vegetables in a seasoned stock thickened with cream and egg yolks. |
| XEROSTOMIA | • xerostomia n. (Medicine) Abnormal dryness of the mouth. • XEROSTOMIA n. excessive dryness of the mouth due to insufficient secretions, also XEROSTOMA. |
| ZOOLATRIES | • ZOOLATRY n. the worship of animals. |