[mahy-kroh-awr-guh-niz-uh m] /ˌmaɪ kroʊˈɔr gəˌnɪz əm/
any too small to be viewed by the unaided eye, as bacteria, protozoa, and some fungi and algae.
any organism, such as a bacterium, protozoan, or virus, of microscopic size
microorganism mi·cro·or·gan·ism (mī’krō-ôr’gə-nĭz’əm)
An organism of microscopic or submicroscopic size, especially a bacterium or protozoan.
An organism that can be seen only with the aid of a microscope and that typically consists of only a single cell. Microorganisms include bacteria, protozoans, and certain algae and fungi. See Note at germ.
Organisms so small that they can be seen only through a microscope. (See bacteria, protozoa, and viruses.)
/ˌmaɪkrəʊˌpælɪɒnˈtɒlədʒɪ/ noun 1. the branch of palaeontology concerned with the study of microscopic fossils
[mahy-kroh-pey-lee-uh n-tol-uh-jee, -pal-ee-] /ˌmaɪ kroʊˌpeɪ li ənˈtɒl ə dʒi, -ˌpæl i-/ noun 1. the branch of dealing with the study of microscopic fossils. micropaleontology (mī’krō-pā’lē-ŏn-tŏl’ə-jē) The branch of paleontology that deals with microfossils.
[mahy-kroh-puh-thol-uh-jee] /ˌmaɪ kroʊ pəˈθɒl ə dʒi/ noun 1. the branch of dealing with the microscopic study of changes that occur in tissues and cells during disease. micropathology mi·cro·pa·thol·o·gy (mī’krō-pā-thŏl’ə-jē) n. The microscopic study of disease changes.
[mahy-kroh-par-uh-sahyt] /ˌmaɪ kroʊˈpær əˌsaɪt/ noun 1. a parasitic microorganism. /ˌmaɪkrəʊˈpærəˌsaɪt/ noun 1. any parasitic microorganism