| pilocarpine | (noun) cholinergic alkaloid used in eyedrops to treat glaucoma | - |
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| pilosity | (noun) the quality of having hair | Synonyms: hairiness |
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| pilot | (noun) small auxiliary gas burner that provides a flame to ignite a larger gas burner | Synonyms: pilot burner, pilot light |
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| (noun) an inclined metal frame at the front of a locomotive to clear the track | Synonyms: buffer, cowcatcher, fender |
| (noun) something that serves as a model or a basis for making copies | Synonyms: archetype, original |
| (noun) a program exemplifying a contemplated series; intended to attract sponsors | Synonyms: pilot film, pilot program |
| (noun) someone who is licensed to operate an aircraft in flight | Synonyms: airplane pilot |
| (noun) a person qualified to guide ships through difficult waters going into or out of a harbor | - |
| pilotage | (noun) the guidance of ships or airplanes from place to place | Synonyms: navigation, piloting |
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| (noun) the occupation of a pilot | Synonyms: piloting |
| pilotfish | (noun) small pelagic fish often accompanying sharks or mantas | Synonyms: Naucrates ductor |
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| pilothouse | (noun) an enclosed compartment from which a vessel can be navigated | Synonyms: wheelhouse |
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| piloting | (noun) the guidance of ships or airplanes from place to place | Synonyms: navigation, pilotage |
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| (noun) the occupation of a pilot | Synonyms: pilotage |