Xylem cells are elongated cells with lignified secondary thickening of the cell walls. Xylem cells are specialised for conduction of water, and first appeared in plants during their transition to land in the Silurian period more than 425 million years ago (see Cooksonia). The possession of xylem defines the vascular plants or Tracheophytes.
hobo. a hobo is an itinerant worker, a career which sprang up during the depression. A hobo, unlike a bum or a tramp, is more than willing to work, but mostly for a short duration, as their main impetus is travel, the love of the journey above the actual destination.
a term used to refer to a black person, especially a male. 2. a term used to refer to a Latin American of black and Native American ancestry, or a person of black and white ancestry. Also, zambo. Sambo was a common given name among black people during the slavery era; it was later a neutral term for a black person. However, after World War II, an increasing sensitivity to racial stereotypes caused the term to be perceived as demeaning and insulting. Examples from the Web for sambo.