Pilo- (from Latin pilus - “hair”) is the first part of compound words, meaning “hair”.
This term is used in words such as:
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Pilocarpine, an alkaloid obtained from the leaves of the South American plant Pilocarpus, stimulates the secretion of sweat and lacrimal glands.
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Pilomotor - causing contraction of the smooth muscles of the hair follicles, causing the hair to “stand on end.”
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Pilonidal - Referring to a pilonidal cyst (a cyst formed from hair follicles).
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Pylorhexis - hair pulling (as a treatment method).
Thus, the prefix pilo- indicates the connection of the term with hair, scalp.