ecto- outside

ectoblast [ecto-, outside+ blast, cell lager] 1.Undifferentiated embryonic ectoderm. 2.Ectoderm, See ectoderm, endoblast, and mesoblast. (EK tuh blas

ectocommensal [ecto-, outside& commensal] An organism, living on the outer body surface of a host organism, but not as a parasite. (ek'toh kuh MEN sul)

ectoderm [ecto-, outside + derm, skin] The outer layer oi the three primary germ cell layers of an embryo from which the nervous system, the epidermis and epidermal tissues, sense organs, and certain other body parts develop. See ectoblast, endoderm, and mesoderm. (EK tuh derm')

ectogenous [ecto-, outside + gen,formation + -ous] Capab of developing and living outside the body of a hostas certain parasitic bacteria. See endobiotic. (ek TOJ uh nus)

ectomere [ecto-, outside & (blasto)mere] A blastomere that develops into ectoderm. See ectoderm. (EK tuh tnihr"

ectomorphic [ecto-, outside+ morph,form + -ic] Having' lean and slightly muscular body build characterized, by the prominence of structures derived from the embryonic ectoderm. See endomorphic and mesomorphic. (ek' toh MOR fik)

ectoparasite [ecto-, outside &parasite] A parasite that lives on the outer surface of its host. See endoparasit and epizoon. (ek' toh PEHR uh seyet')

ectoplasm [ecto-, outside+ plasm, protoplasm] The outer, more rigid portion of the cytoplasm of a cell. See endoplasm. (EK tuh plaz'um)

ectotherm [ecto-, outside + therm, temperature] A cold- blooded animal, such as a fish or reptile, whose body temperature varies with the environment. Same as poikilotherm. (EK tuh thurm')

ann year
enn years

annuals [ann, year + -als] 1.A yearly chronological record of events. 2.Historical records. Chronicles. See chronicle. 3.Records of the proceedings and activities of an organization or field of learning. (AN ulz)

anniversary [ann, year + vers, turn + -ary] The yearly recurrence of a past event, as the date of a wedding. (an' uh VUR suh tee)

annoDomini [ann, year& Ltn > dominicus, of the Lord] Literally, "the year of our Lord." Used mainly in the abbreviated form A.D. to indicate a specified year in the Christian era. (AN oh DOM uh nee)

annual ring [ann, year + -ual & ring] A concentric layer wood produced by one year's growth of a tree or othe woody plant. (AN yoo ul ring)

annuity [ann, year + -ity] An allowance or income paid yearly or at other regular intervals. (uh NOO ih tee)

annus mirabilis [ann, year & Ltn > mirabilis, wonders] Literally, "year of wonders." A year regarded as pivotal, fateful, notable, etc. (AN us mih RAB uh lis)

ann, enn

biannual [bi-, two + ann, year + -ual] Occurring twice a year. See biennial (def. 1). (beye AN yoo ul)

bicentennial [bi-, two + cent, hundred + enn, years + -ial] Occurring once every two hundred years. See semicentennial. (beye'sen TEN ee ul)

biennial [bi-, two + enn, years+ -ial] 1.0ccurring once every two years. See biannual. 2.Lasting or living for two years. (beye EN ee ul)

biennium [bi-, two + enn, years + -ium] A period of two years. (beye EN ee um)

centenarian [cent, hundred + enn, years + -arian] A person who is at least 100 years of age. (sent'n EHR ee un)

centennial [cent, hundred + enn, years + -ial] Occurring once every one hundred years. (sen TEN ee ul)

decennial [dec,ten+enn,years+-iaI] 1.0ccurring once every ten years. 2.Lasting or continuing for ten years. (dih SEN ee ul)

decennium [dec, ten + enn, years + -ium] A period of ten years. Decade. (dih SEN ee um)

millenarian [mill, thousand + enn, years + -arian] 1.Pertaining to one thousand, especially one thousand years. 2.Pertaining to belief in the millennium. (mil'uh NEHR ee un)

millennium [mill, thousand + enn, years + -ium] 1.A period of one thousand years. 2.The period of one thousand years mentioned in the Bible during which Christ will rule on earth. (mih LEN ee um)

octennial [oct-, eight+ enn, years+ -ial] 1.0ccurring once every eight years. 2.Lasting or continuing for eight years. (ok TEN ee ul)

per annurn [per (by] & ann, year + -um] By the year. Yearly. Annually. See annual (def. 1). (per AN um)

perennate [per-, through + enn, years + -ate] To last from year to year or for many years. (PEHR uh nayt')

postmillennial [post-, after + mill, thousand + enn, years + - ial] Occurring or existing after the millennium. See premillennial. (pohst'mih LEN ee ul)

premillennial [pre-, before + mill, thousand + enn, years + - ial] Occurring or existing before the millennium. See postmillennial. (pree'mih LEN ee ul)

quadrennial [quadrfour + enn, years+ -ial] 1.0ccurring once every four years. 2.Lasting or continuing for four years. (kwah DREN ee ul)

quadrennium. [quadrfour + enn, years + -ium] A period of four years. (kwah DREN ee um)

quadricentennial [quadri,four + cent, hundred + enn, years + -ial] Occurring once every four hundred years. (kwod'ruh sen TEN ee ul)

quincentennial [quin,five +cent, hundred+ enn, years+ - ial] Occurring once every five hundred years. (kwin'sen TEN ee ul)

quindecennial [quin,five + dec, ten + enn, years + 4al] 1.Occurring once every fifteen years. 2.Lasting or continuing for fifteen years. (kwin' dih SEN ee ul)

quinquennial [quinque,five + erm, years + -ial] 1.0ccurring once every five years. 2.Lasting or continuing for five years. (kwin KWEN ee ul)

quinquennium [quinque,five + enn, years + -ium] A period of five years. (kwin KWEN ee um)

semiannual [semi-, half+ ann, year + -ual] Occurring twice a year. Same as biannual. (sem'ee AN yoo ul)