Hypobranchial: underneath (_hypo_) the gills.
Hypophysis: sensitive-offshoot from the brain in the vertebrate.
Lecith-: pertaining to the yelk (_lecithus_); hence:— Centrolecithal: eggs with the yelk in the centre. Lecithoma: the yelk-sac. Telolecithal: eggs with the yelk at one end.
Meroblastic: cleaving in part (_meron_) only.
Meta-: (in compounds) the “after” or secondary stage; hence:— Metagaster: the secondary or permanent gut (_gaster_). Metaplasm: secondary or differentiated plasm. Metastoma: the secondary or permanent mouth (_stoma_). Metazoa: the higher or later animals, made up of many cells. Metovum: the mature or advanced ovum.
Metamera: the segments into which the embryo breaks up.
Metamerism: the segmentation of the embryo.
Monera: the most primitive of the unicellular organisms.
Monism: belief in the fundamental unity of all things.
Morphology: the science of organic forms (generally equivalent to anatomy).
Myotomes: segments into which the muscles break up.
Nephra: the kidneys; hence:— Nephridia: the rudimentary kidney-organs. Nephrotomes: the segments of the developing kidneys.
Ontogeny: the science of the development of the individual (generally equivalent to embryology).
Perigenesis: the genesis of the movements in the vital particles.
Phagocytes: cells that absorb food (_phagein_ = to eat).
Phylogeny: the science of the evolution of species (_phyla_).
Planocytes: cells that move about (_planein_).
Plasm: the colloid or jelly-like matter of which organisms are composed; hence:— Caryoplasm: the matter of the nucleus (_caryon_). Cytoplasm: the matter of the body of the cell. Deutoplasm: secondary or differentiated plasm. Metaplasm: secondary or differentiated plasm. Protoplasm: primitive or undifferentiated plasm.
Polyspermism: the penetration of more than one sperm-cell into the ovum.
Pro- or Prot: (in compounds) the earlier form (opposed to Meta); hence:— Prochorion: the first form of the chorion. Progaster: the first or primitive stomach. Pronephridia: the earlier form of the kidneys. Prorenal: the earlier form of the kidneys. Prostoma: the first or primitive mouth. Protists: the earliest or unicellular organisms. Provertebræ: the earliest phase of the vertebræ. Protophyta: the primitive or unicellular plants. Protoplasm: undifferentiated plasm. Protozoa: the primitive or unicellular animals.