Biogenesis is the production of living organisms only from other living organisms. Compare spontaneous generation.
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Dialysis is the separation of soluble substances from colloids by diffusion through a semipermeable membrane.
Perithecium is a spherical, cylindrical, or oval ascocarp that usually opens by a slit or pore at the top.
Cytostome is the opening through which food is ingested in ciliates.
Sporangiophores is asexual spores that develop within a sec (sporangium).
Pilus means any filamentous appendage other than flagella on certain Gram-negative bacteria.
Icosahedron is a solid formed of 20 triangular faces and 12 corners; the geometrical shape of many virions.
Floccule is an adherent aggregate of microorganisms or other materials floating in or on a liquid.