1. Produced by or producing fever
   - pyrogenic, pyrogenetic 
2. Produced under conditions involving intense heat
   - igneous, pyrogenic

See also: heat, pyrogen

• unaccredited
• unaccustomed
• unachievable
• unachievably
• unacknowledged
• unacquainted
• unacquainted with
• unacquisitive
• unactable
• unadaptability
• unadaptable
• unadapted
• unaddicted
• unaddressed
• unadjustable
• unadjusted
• unadmonished
• unadoptable
• unadorned
• unadulterated
• unadventurous
• unadvisable
• unadvised
• unadvisedly
• unaerated