Not causing flatulence. Obsolete. rare.

(un-, prefix1 affix 2b.)

Not poisonous, free from poison; without venom.

Pathology. Causing no pain, painless; esp. in indolent tumour, indolent ulcer.

(un-, prefix1 affix 1.)

(un-, prefix1 affix 1.)

Not poisoned (in various senses).

Of a substance: not causing irritation of the skin or other tissue.

Not corrosive; having no tendency to corrosion.

Not irritating; spec. = non-irritant, adj.

(un-, prefix1 affix 2.)

Not causing an allergic reaction; non-allergenic. Also: not affected with or resulting from an allergy.

Having little tendency to cause an allergic reaction; specially prepared or treated so as to cause no reaction in persons allergic to the normal…