Any microorganism that has lost the ability to synthesize an organic compound required for its growth, usually as a result of mutation
boxholder
boxholder
noun
A renter of a post office box.
An owner of a box in a theatre/theater, stadium, etc.
boxthorns
boxthorns
noun
plural of boxthorn
calothrix
chronaxia
chronaxie
chronaxie
noun
The minimum time over which an electric current must be applied in order to stimulate a muscle fiber or nerve cell.
dihydroxy
dihydroxy
adj
(chemistry) containing two hydroxy functional groups
endothrix
endothrix
noun
A dermatophyte infection of the hair that invades the hairshaft and internalizes into the hair cell.
exhibitor
exhibitor
noun
Someone who exhibits something.
Someone who organizes an exhibition.
exhorters
exhorters
noun
plural of exhorter
exhorting
exhorting
noun
exhortation
verb
present participle of exhort
exhumator
exhumator
noun
One who exhumes or disinters.
exochorda
exophoria
exophoria
noun
(ophthalmology) A form of heterophoria in which there is a tendency of the eyes to deviate outward.
exophoric
exophoric
adj
(linguistics) Relating to, or exhibiting, exophora.
Relating to, or afflicted with, exophoria.
noun
A person who has exophoria.
exorhason
exosphere
exosphere
noun
an extremely thin atmosphere, as on Saturn's moon Dione
the uppermost layer of a planet's atmosphere
exstrophy
exstrophy
noun
(anatomy) The eversion or turning out of any organ, or of its inner surface.
(especially) A congenital malformation of the bladder in which the normally internal mucosa of the organ lies exposed on the abdominal wall because of failure of union between the halves of the pubic symphysis and between the adjacent halves of the abdominal wall.
heterodox
heterodox
adj
Of or pertaining to creeds, beliefs, or teachings, especially religious ones, that are different from orthodoxy, or the norm, but not sufficiently different to be called heretical.
heterosex
heterosex
noun
(sexuality) Heterosexual sex.
verb
(sociology, transitive) To make heterosexual.
hexachord
hexachord
noun
(music) A series of six tones denoted with the syllables ut-re-mi-fa-sol-la separated by seconds, the only of which that is a minor second being mi-fa.
hexameron
hexameron
noun
(literature) A treatise concerning the biblical creation story.
(theology) The narrative in the Book of Genesis describing the events of the hexameron.
(theology) The six days in which God created the world according to the biblical creation story.
hexestrol
hexestrol
noun
(pharmacology) A synthetic non-steroidal estrogen of the stilbestrol group, formerly used to treat estrogen deficiency.
hoaxproof
hydroxide
hydroxide
noun
(chemistry) An univalent anion (OH⁻) based on the hydroxyl functional group.
Any substance containing such an anion.
hydroxyls
hydroxyls
noun
plural of hydroxyl
lagothrix
leiothrix
leiothrix
noun
Either of two babblers of the genus Leiothrix within the family Leiothrichidae.
lepothrix
lophortyx
myxorrhea
myxorrhea
noun
Excessive secretion of mucus
orthoaxis
orthodoxy
orthodoxy
noun
Conformity to established and accepted beliefs (usually of religions).
Correctness in doctrine and belief.
oxyhydric
oxyrhynch
oxytricha
prothorax
prothorax
noun
(entomology) The anterior segment of the insect thorax; it carries the first pair of legs
proxyship
proxyship
noun
The office or agency of a proxy.
pyothorax
pyothorax
noun
pleural empyema; an accumulation of pus in the pleural cavity
rheotaxis
rheotaxis
noun
(biology) movement in response to a current (of water or air)
rhizotaxy
rhizotaxy
noun
Alternative form of rhizotaxis
roxburghe
thermofax
thiothrix
thriftbox
thyroxine
thyroxine
noun
(biochemistry) A hormone (an iodine derivative of tyrosine), produced by the thyroid gland, that regulates cell metabolism and growth.
thyroxins
thyroxins
noun
plural of thyroxin
xanthoura
xenophora
xenophora
noun
(biology) Any mollusk of the genus Xenophora.
xeromorph
xeromorph
noun
any plant, with xeromorphic leaves, that is adapted to a dry atmosphere; a xerophyte
xerophagy
xerophagy
noun
A restrictive diet (of bread and water, for example) as a punishment or religious form of discipline.
xerophile
xerophile
noun
Any xerophilic organism.
xerophily
xerophily
noun
Quality of being xerophilic.
xerophyte
xerophyte
noun
(botany) Any plant suited for life in a habitat where water is scarce, such as in a desert or chaparral. Such plants may be succulent, have small or reduced leaves, or spines.
A desert plant
xerotherm
xerotherm
noun
Any xerothermic organism.
xiphosura
xiphosure
xiphosure
noun
One of the Xiphosura, such as a horseshoe crab.
xylograph
xylograph
noun
A print taken from such an engraving.
An engraving in wood or woodcut, especially one used in printing predating the Western tradition (14th c.).
verb
(transitive) To make a print from an engraving in wood.