Webster’s Revised Unabridged Dictionary · 1913
Incubate
In′cu·bate (ĭn̲′kū·bāt), v. i. & t. [imp. & p. p. Incubated; p. pr. & vb. n. Incubating.] [L. incubatus, p. p. incubare to lie on; pref. in- in, on + cubare to lie down. Cf. Cubit, Incumbent.] To sit, as on eggs for hatching; to brood; to brood upon, or keep warm, as eggs, for the purpose of hatching.