| estrus cycle | A reproductive cycle in some female mammals (but not female humans, who instead have menstrual cycles). The cycle is characterised by a short period of intense sexual desire (called estrus or heat) when the animal is fertile, which often occurs only once or twice a year, and involves correlating physical changes of the reproductive tract. (09 Oct 1997) |
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| estrus detection | Methods for recognition of the state of estrus. (12 Dec 1998) |
| estrus synchronization | Occurrence or induction of estrus in all of the females in a group at the same time, applies only to animals. (12 Dec 1998) |
| estuary | <ecology, marine biology> An inlet or arm of the sea, especially the wide mouth of a river, where the tide meets the current. (09 Oct 1997) |