Pulse has no root word. It is from the Latin pulsus which is from Latin pellere (to set in motion by beating or striking) and the suffix -tus (the suffix for action verbs).
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In Greek it means "receptacle', while in medicine it's a prefix relating to blood vessels.
Because it ends in "-oid," you can tell it's an adjective. It means to resemble a blood vessel.
Intra, meaning inside and vena, blood vessel, both Latin.
little vessel
Vas is a Latin word meaning "vessel".