A larger part of an organism, composed of tissues that perform similar functions.
User Defined Definitions
"a fully differentiated structural and functional unit in an animal that is specialized for some particular function"
"a government agency or instrument devoted to the performance of some specific function"
"a periodical that is published by a special interest group"
"wind instrument whose sound is produced by means of pipes arranged in sets supplied with air from a bellows and controlled from a large complex musical keyboard"
"a free-reeded instrument with a piano keyboard in which air is forced through the reeds by bellows"