Webster's English Dictionary

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incubate

in.cu.bate \'in-ky*-.ba-t, 'in-\ \-.ba-t-iv\ vb [L incubatus, pp. of 
   incubare, fr. in- + cubare to lie]- more at HIP 1: to sit upon (eggs) so as 
   to hatch by the warmth of the body; also  : to maintain (as an embryo or a 
   chemically active system) under conditions favorable for hatching, 
   development, or reaction 2: to cause to develop  1: to sit on eggs  2: to 
   undergo incubation  - in.cu.ba.tive aj