Nosology, nos-ol′o-ji, n. the science of diseases: the branch of medicine which treats of the classification of diseases.—adj. Nosolog′ical.—n. Nosol′ogist. [Gr. nosos, disease, logia, discourse.]

Nosonomy, nō-son′o-mi, n. the classification of diseases. [Gr. nosos, a disease, onoma, a name.]

Nosophobia, nos-o-fō′bi-a, n. morbid dread of disease. [Gr. nosos, a disease, phobia, fear.]

Nostalgia, nos-tal′ji-a, n. home-sickness, esp. when morbid.—adj. Nostal′gic. [Gr. nostos, a return, algos, pain.]

Nostoc, nos′tok, n. a genus of Algæ, found in moist places.—Also Witches' butter, Spittle of the stars, Star-jelly, &c. [Ger. nostoch.]

Nostology, nos-tol′o-ji, n. the science of the phenomena of extreme old age or senility in which there is ever seen a return to the characteristics of the youthful stage.—adj. Nostolog′ic. [Gr. nostos, return, logialegein, to speak.]

Nostradamus, nos-tra-dā′mus, n. any quack doctor or charlatan—from the French astrologer (1503-66).

Nostril, nos′tril, n. one of the openings of the nose. [M. E. nosethirl—A.S. nosthyrlnosu, nose, thyrel, opening. Cf. Drill, to pierce, and Thrill.]

Nostrum, nos′trum, n. any secret, quack, or patent medicine: any favourite remedy or scheme. [L., 'our own,' from nos, we.]

Not, not, adv. a word expressing denial, negation, or refusal.—Not in it (coll.), having no part in some confidence or advantage. [Same as Naught, from A.S. , wiht, a whit.]