Basic Tissue Types. All of the various tissues of the human body can be categorized into four basic tissue types. All organs are built of these four tissues, which have consistent characteristics and arrangements from organ to organ. Thus an appreciation of the major features of these four basic tissue types can greatly simplify your understanding of the cellular composition of the many organ systems. 1  OVERVIEW.
Definition of session for English Language Learners : a period of time that is used to do a particular activity : a formal meeting or series of meetings of a group of people (such as a court of law or legislature)
(plural schoolmarms) (US, slang) A woman who is a teacher, especially a teacher in a schoolhouse; may carry the connotation she is severe. The schoolmarm, running the old west one-room school, is a stock character in western movies. A person, male or female, who exhibits characteristics attributed to schoolteachers of the old times (as strict adherence to arbitrary rules, is strict on those who don't comply to those rules, etc.) (forestry) A tree with two or more trunks; a forked tree.