Definition: Pyralidiform is a scientific term used in the field of embryology and developmental biology. It refers to a type of organ that forms from an egg, called a pyralidium, which develops into a sac-like structure called a paryliform organ (pyraloid). This organ is typically found in birds, reptiles, and some mammals, and it plays a crucial role in the development of these animals. The term was first used by French embryologist Louis Pasteur in
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