A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Ob Oc Od Ol Om Op Or Os Ot Ov Ox
Ora Orb Org Ori

Ora

Noun

1. Plural form of Latin os, the mouth or openings, especially of the cervix. (wiktionary.org)

2. An edge or margin. (biology-online.org)