insulin hormone secreted by the isles of Langerhans in the pancreas
insolent marked by casual disrespect
insomnia an inability to sleep
insulant a material that reduces or prevents the transmission of heat or sound or electricity
insolence the trait of being rude and impertinent
insular relating to or characteristic of or situated on an island
inulin used to manufacture fructose and in assessing kidney function
insidious working or spreading in a hidden and usually injurious way
insignia a badge worn to show official position
incline lower or bend, as in a nod or bow
insulate surround with material to protect from heat, cold, or noise
insulting expressing extreme contempt
insulation reduction of the transmission of sound, heat, or electricity
insult treat, mention, or speak to rudely
insane afflicted with or characteristic of mental derangement
in line awaiting something; especially something due
unsullied free from blemishes
ensure make certain of
ancillary furnishing added support
insolation incident solar radiation