analgesic
pertaining to without pain
anesthesia
pertaining to no sensation
antagonist
one that opposes competition
antibiotic
pertaining to against life
antipyretic
pertaining to against fever
antiseptic
pertaining to against infection
antitussive
pertaining to against coughing
aseptic
pertaining to no infection
emetic
pertaining to vomiting
enteral
pertaining to intestines
parenteral
pertaining to around intestines
subcutaneous
pertaining to beneath the skin
zoonosis
condition of animal disease
transdermal
pertaining to across the skin