Chaetodon xanthocephalus, the yellowhead butterflyfish. / Opistognathus aurifrons, the yellowheaded jawfish. / A plant of some species of genus Inula of the daisy family.

(pathology) The cessation of breathing, most often in reference to transient instances thereof during sleep.

(military, transitive) To prepare a building for defense by preparing slits or holes through which to fire on attackers / (transitive) To exploit (a law, etc.) by means of loopholes.

(genetics) replication of DNA between noncognate viruses