Some libraries have eliminated their card catalog in favour of the OPAC for the purpose of saving space for other use, such as additional shelving. The largest library catalog in the world is the WorldCat.org union catalog managed by the non-profit library cooperative OCLC, based in Dublin, Ohio. As of January 2016, WorldCat.org has over 360,000,000 catalog records and over 2 billion library holdings. Card catalog at Yale.
Weed definition, a valueless plant growing wild, especially one that grows on cultivated ground to the exclusion or injury of the desired crop. See more. Dictionary.com
Thorn(noun) a hard and sharp-pointed projection from a woody stem; usually, a branch so transformed; a spine. Thorn(noun) any shrub or small tree which bears thorns; especially, any species of the genus Crataegus, as the hawthorn, whitethorn, cockspur thorn. Thorn(noun) fig.: That which pricks or annoys as a thorn; anything troublesome; trouble; care. Thorn(noun) the name of the Anglo-Saxon letter /, capital form /.