Tissues

Careful observations (without a microscope) showed Bichat that the various organs were built up out of a mixture of different types of simpler structures, each of which might occur in many different organs. Because these structures were usually flat and delicately thin, they were called tissues.
 Marie François Xavier Bichat France 1800 Tissues

Careful observations (without a microscope) showed Bichat that the various organs were built up out of a mixture of different types of simpler structures, each of which might occur in many different organs. Because these structures were usually flat and delicately thin, they were called tissues.