A summons to arms, as on the approach of an enemy. / Any sound or information intended to give notice of approaching danger; a warning sound to arouse attention; a warning of danger.

(transitive) To call to arms for defense / (transitive) To give (someone) notice of approaching danger / (transitive) To rouse to vigilance and action; to put on the alert.

Congenitally lacking melanin pigmentation in the skin, eyes, and hair or feathers (or more rarely only in the eyes); born with albinism.

(countable) A person or animal congenitally lacking melanin pigmentation in the skin, eyes, and hair or feathers (or more rarely only in the eyes); one born with albinism.

(historical) In Ancient Rome, a white tablet or register on which the praetor's edicts and other public notices were recorded. / A book specially designed to keep photographs, stamps, or autographs.

(anatomy) A wing or winglike anatomic process or part, especially of bone.

(colloquial) Alternative form of a la.

A large seabird, Diomedea exulans, with a very large wingspread.

A bony tunnel through the basisphenoid bone of the skull. The maxillary artery and nerve pass through it.

The opening at either end of the alar canal, with the rostral alar foramen closer to the nose and the caudal or posterior alar foramen closer to the back of the skull.