Part 624

||Ec*thlip"sis (?), n. [L., fr. Gr. &?;, fr. &?; to squeeze out.] 1. The dropping out or suppression from a word of a consonant, with or without a vowel.

2. (Lat. Pros.) The elision of a final m, with the preceding vowel, before a word beginning with a vowel.

||Ec`tho*re"um (?), n.; pl. Ecthorea (#). [NL., fr. Gr. &?; to leap out; ek out + &?;, &?;, to leap, dart.] (Zoöl.) The slender, hollow thread of a nettling cell or cnida. See Nettling cell. [Written also ecthoræum.]

||Ec*thy"ma (?), n.; pl. Ecthymata (#). [NL., fr. Gr. &?; pimple, fr. &?; to break out.] (Med.) A cutaneous eruption, consisting of large, round pustules, upon an indurated and inflamed base. Dunglison.

Ec"to- (?). See Ect-.

Ec"to*blast (?), n. [Ecto- + Gr. &?; 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.

||Ec`to*bron"chi*um (?), n.; pl. Ectobronchia (#). [NL. See Ecto-, and Bronchia.] (Anat.) One of the dorsal branches of the main bronchi in the lungs of birds.

{ Ec`to*cu*ne"ri*form (?), Ec`to*cu"ni*form (?), } n. [Ecto- + cuneiform, cuniform.] (Anat.) One of the bones of the tarsus. See Cuneiform.

Ec"to*cyst (?), n. [Ecto- + Gr. &?; bladder.] (Zoöl.) The outside covering of the Bryozoa.

Ec"to*derm (?), 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.

{ Ec`to*der"mal (?), Ec`to*der"mic (?), } a. (Biol.) Of or relating to the ectoderm.

Ec`to*lec"i*thal (?), a. [Ecto- + Gr. &?; 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.

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

Ec`to*par"a*site (?), n. (Zoöl.) Any parasite which lives on the exterior of animals; -- opposed to endoparasite. -- Ec`to*par`a*sit"ic (#), a.

||Ec*to"pi*a (?), n. [NL., fr. Gr. 'ek out + &?; place.] (Med.) A morbid displacement of parts, especially such as is congenial; as, ectopia of the heart, or of the bladder.

Ec*top"ic (?), a. (Med.) Out of place; congenitally displaced; as, an ectopic organ.

Ec"to*plasm (?), n. [Ecto- + Gr. &?; form.] (Biol.) (a) The outer transparent layer of protoplasm in a developing ovum. (b) The outer hyaline layer of protoplasm in a vegetable cell. (c) The ectosarc of protozoan.

Ec`to*plas"tic (?), a. [Ecto- + Gr. &?; to mold.] Pertaining to, or composed of, ectoplasm.

||Ec`to*proc"ta (?), n. pl. [NL., fr. Gr. &?; outside + &?; the anus.] (Zoöl.) An order of Bryozoa in which the anus lies outside the circle of tentacles.

Ec"to*py (?), n. (Med.) Same as Ectopia.

Ect*or"gan*ism (?), n. [Ect- + organism.] (Biol.) An external parasitic organism.

Ec"to*sarc (?), n. [Ecto- + Gr. &?;, &?;, flesh.] (Biol.) The semisolid external layer of protoplasm in some unicellular organisms, as the amœba; ectoplasm; exoplasm.

Ec*tos"te*al (?), a. (Physiol.) Of or pertaining to ectostosis; as, ectosteal ossification.

||Ec`tos*to"sis (?), n. [NL. See Ect-, and Ostosis.] (Physiol.) A process of bone formation in which ossification takes place in the perichondrium and either surrounds or gradually replaces the cartilage.

Ec`to*zo"ic (?), a. (Zoöl.) See Epizoic.

||Ec`to*zo"ön (?), n.; pl. Ectozoa (#). [NL., fr. Gr. 'ekto`s outside outside + zw^,on an animal.] (Zoöl.) See Epizoön.

||Ec*tro"pi*on (?), n. [NL., fr. Gr. &?;, fr. &?; a turning aside; &?; from + &?; to turn.] (Med.) An unnatural eversion of the eyelids.

||Ec*tro"pi*um (?), n. [NL.] (Med.) Same as Ectropion.