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all-nighter a night spent without sleeping, esp. in order to work on something.
allo- other; different; variation.
allocate to assign or set aside (money or other resources) for some specific use. [2 definitions]
all of a sudden suddenly; without warning.
allogamy the technique or process of cross-fertilization in plants.
allomerism change in chemical composition without accompanying change in crystalline form.
allomorph any of several alternate structural forms of the same chemical compound; paramorph. [2 definitions]
allopath one who favors or practices allopathy.
allopathy treatment of disease with agents intended to produce effects that are different from those of the disease. (Cf. homeopathy.)
allophone in phonetics, any of the variants of a phoneme.
allosaurus any of various large meat-eating dinosaurs of the Jurassic and Cretaceous periods.
allot to designate as a portion. [2 definitions]
allotment the act of allotting or something that is allotted; appropriation or share. [2 definitions]
allotrope one of several forms in which a chemical element may exist.
allotropic pertaining to or having the property of allotropy.
allotropy the existence of some chemical elements in more than one structural form.
allottee one who receives an allotment.
all-out using every resource or means available.
allover covering, or repeated over, an entire surface.
all over in every part of something; everywhere.
all over with completed; finished.