Ambulatory wart see ampulla

ame- see amoe- for words not found here ameiosis n. [Gr. a, without; meiosis, to make smaller] Failure of meiosis that is replaced by a form of nuclear division not involving the reduction of the chromosome number.

ameiotic a. [Gr. a, without; meiosis, to make smaller] Pertaining to maturation division of a gamete without the diploid number of chromosomes being reduced to the haploid.

ameiotic parthenogenesis Parthenogenesis without meiosis.

amensalism n. [Gr. a, without; L. mensa, table] A form of symbiotic relationship in which one of the organisms is inhibited and the other is not.

ametabolic a. [Gr. a, without; metabole, change] Without metamorphosis; ametamorphic.

ametabolous metamorphosis (ARTHRO: Insecta) Insects whose eggs hatch into nymphs closely resembling the adult form, differing only in size and life stages; without metamorphosis.

ametamorphic a. [Gr. a, without; meta, after; morphe, form] Having no metamorphosis.

amethystine a. [Gr. amethystos, not drunk] Pertaining to, or resembling amethyst, a bluish-violet color.

amicron n. [Gr. a, without; mikros, small] One of the smallest particles detectable with the electron microscope; smaller than one (1) nm and can only be seen as a diffuse illumination in the track of the beam.

amicroscopic a. [Gr. a, without; mikros, small; skopein, to view] Too small to be seen with either the light microscope or the electronmicroscope; less than about one (1) nanometer in diameter.

amictic egg Eggs that do not undergo a meiotic division and are therefore diploid producing females parthenogeneti-cally. see mictic egg.

aminosugar n. [prefix names of chemical compounds containing one of the amino groups; Gr. sakcharon, sugar] A monosaccharide with an amino or substituted amino group in place of a nonglycosidic hydroxyl group.

amitosis n. [Gr. a, without; mitos, thread] Cellular division without the appearance of chromosomes or any mitotic figure. amitotic a. see mitosis.

amixia, amixis n. [Gr. a, without; mixis, a mixing] Absence of interbreeding between members of the same species or races due to morphological, geographical or physiological isolation.

ammochaeta n.; pl. -tae [Gr. ammos, sand; chaite, long hair] (ARTHRO: Insecta) In Hymenoptera, specialized hairs or bristles on the head or lower lip of desert ants, used for removing sand from the strigils on the forelegs.

ammonite n. [Gr. Ammon, Jupiter] (MOLL: Cephalopoda) Any fossil ammonean shell curved into a spiral like a ram's horn, common in Paleozoic and Mesozoic rocks of all parts of the world.

ammonitiferous a. [Gr. Ammon, Jupiter; ferre, to carry] Said of rocks containing ammonites.

ammonoid a. [Gr. Ammon, Jupiter] (MOLL: Cephalopoda) Pertaining to a shell covered cephalopod.

ammonotelic a. [Gr. ammoniakon, temple of Jupiter Ammon; telos, end] The excretion of nitrogen principally as ammonia. see uricotelic.

ammophilous a. [Gr. ammos, sand; philos, loving] Sand-loving; living in or frequenting sand.

amnion n.; pl. -nions, -nia [Gr. amnion, membrane around the fetus] (ARTHRO) The inner cellular, membranous embryonic covering of various insects and other arthropods. amniotic a.

amnios n. [Gr. amnion, membrane around the fetus] (ARTHRO: Insecta) Cuticular covering of an embryo that is shed before or very shortly after hatching.

amniotic cavity The cavity between the amnion and the embryo in the developing egg of various invertebrates.

amniotic fluid Liquid surrounding the embryo while in the egg.

amniotic folds Lateral folds of the amnion that meet to enclose the germ band in the ovum.

amniotic pore (ARTHRO: Insecta) An opening to the amniotic cavity during embryonic development.

amoeba, ameba n. [Gr. amoibe, change] Any amoeba-like cell or corpuscle of the blood or other parts of an organism.

amoebocyte n. [Gr. amoibe, change; kytos, container] 1. Certain body cells or tissues capable of independent amoeba-like movement. 2. (PORIF) Any mesohyl cell where no special activity is evident. see plasmatocyte.

amorph n. [Gr. a, without; morphe, form] An inactive allele that acts as a genetic block to biosynthesis.

amorpha n. [Gr. a, without; morphe, form] (ARTHRO: Insecta) Those pupa that share no resemblance with the imago.

amorphous a. [Gr. a, without; morphe, form] Lacking distinctive form or structure; shapeless.

AMP Adenosine monophosphate

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