{ . [ Gr. 'ekto`s outside outside. ] A combining form signifying without, outside, external. [ 1913 Webster ]

See Ect-. [ 1913 Webster ]

n. [ Ecto- + Gr. &unr_; bud, germ. ] (Biol.) (a) The outer layer of the blastoderm; the epiblast; the ectoderm. (b) The outer envelope of a cell; the cell wall. Agassiz. [ 1913 Webster ]

‖n.; pl. Ectobronchia [ NL. See Ecto-, and Bronchia. ] (Anat.) One of the dorsal branches of the main bronchi in the lungs of birds.

{ } n. [ Ecto- + cuneiform, cuniform. ] (Anat.) One of the bones of the tarsus. See Cuneiform. [ 1913 Webster ]

n. [ Ecto- + Gr. &unr_; bladder. ] (Zoöl.) The outside covering of the Bryozoa. [ 1913 Webster ]

n. [ Ecto- + -derm. ] (Biol.) (a) The outer layer of the blastoderm; epiblast. (b) The external skin or outer layer of an animal or plant, this being formed in an animal from the epiblast. See Illust. of Blastoderm.

{ } a. (Biol.) Of or relating to the ectoderm. [ 1913 Webster ]

a. [ Ecto- + Gr. &unr_; the yolk of an egg. ] (Biol.) Having the food yolk, at the commencement of segmentation, in a peripheral position, and the cleavage process confined to the center of the egg; as, ectolecithal ova. [ 1913 Webster ]

n. [ Ecto- + -mere. ] (Biol.) The more transparent cells, which finally become external, in many segmenting ova, as those of mammals. [ 1913 Webster ]