||Onus probandi[L.], obligation to furnish evidence to prove a thing; the burden of proof.

(On"ward) a.

1. Moving in a forward direction; tending toward a contemplated or desirable end; forward; as, an onward course, progress, etc.

2. Advanced in a forward direction or toward an end.

Within a while, Philoxenus came to see how onward the fruits were of his friend's labor.
Sir P. Sidney.

(On"ward), adv. Toward a point before or in front; forward; progressively; as, to move onward.

Not one looks backward, onward still he goes.

(On"ward*ness), n. Progress; advancement.

(On"wards) adv. [See -wards.] Onward.

(On"y) a. Any. [Obs.] Chaucer.

(On"y*cha) n. [NL., from L. onyx, -ychis, onyx, also, a kind of mussel, Gr. . See Onyx.]

1. An ingredient of the Mosaic incense, probably the operculum of some kind of strombus. Ex. xxx. 34.

2. The precious stone called onyx. [R.]

(||O*nych"i*a) n. [NL. See Onyx.] (Med.) (a) A whitlow. (b) An affection of a finger or toe, attended with ulceration at the base of the nail, and terminating in the destruction of the nail.

Ontogenesis to Open

(On`to*gen"e*sis On*tog"e*ny) n. [See Ontology, and Genesis.] (Biol.) The history of the individual development of an organism; the history of the evolution of the germ; the development of an individual organism, — in distinction from phylogeny, or evolution of the tribe. Called also henogenesis, henogeny.

(On`to*ge*net"ic) a. (Biol.) Of or pertaining to ontogenesis; as, ontogenetic phenomena.On`to*ge*net"ic*al*ly adv.

(On`to*gen"ic) a. (Biol.) Ontogenetic.

(On`to*log"ic) a. Ontological.

(On`to*log"ic*al) a. [Cf. F. ontologique.] Of or pertaining to ontology.

(On`*to*log"ic*al*ly), adv. In an ontological manner.

(On*tol"o*gist) n. [Cf.F. ontologiste.] One who is versed in or treats of ontology. Edin. Rev.

(On*tol"o*gy) n. [Gr. the things which exist (pl.neut. of being, p. pr. of to be) + - logy: cf.F. ontologie.] That department of the science of metaphysics which investigates and explains the nature and essential properties and relations of all beings, as such, or the principles and causes of being.

(||O"nus) n. [L.] A burden; an obligation.

  By PanEris using Melati.

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