Infrequent: alternatives and connections

(statistics) the difficulty of applying Bayes' theorem is that the probabilities of the different causes are seldom known, in which ca…

A rare zeolitic mineral occurring in white monoclinic crystals with pearly luster. It is a hydrous silicate of aluminia, baryta, and s…

A comparatively rare element related to zinc, and occurring in some zinc ores. It is a white metal, both ductile and malleable. Symbol…

A rare metallic element, occurring in the minerals cerite, allanite, monazite, etc. Symbol Ce. Atomic weight 141.5. It resembles iron…

A comparatively rare element occurring most abundantly in the mineral chromite. Atomic weight 52.5. Symbol Cr. When isolated it is a h…

A rare element of the vanadium group, first found in a variety of the mineral columbite occurring in Connecticut, probably at Haddam.…

the activities of educating or instructing; activities that impart knowledge or skill; "he received no formal education"; "our instruc…

A rare metallic element associated with several other rare elements in the mineral gadolinite from Ytterby in Sweden. Symbol Er. Atomi…

Forming an exception; not ordinary; uncommon; rare; hence, better than the average; superior.

Exceeding the common degree, measure. or condition; hence, remarkable; uncommon; rare; wonderful; as, extraordinary talents or grandeu…

A supposed rare metallic element, with a characteristic spectrum, found associated with yttrium and other rare metals. Its individuali…

A man endowed with uncommon vigor of mind; a man of superior intellectual faculties; as, Shakespeare was a rare genius.

Happening or done every hour; occurring hour by hour; frequent; often repeated; renewed hour by hour; continual.

A form of sleep or somnambulism brought on by artificial means, in which there is an unusual suspension of some powers, and an unusual…

a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth

A rare element of the group of the earth metals, allied to aluminium. It occurs in certain rare minerals, as cerite, gadolinite, orthi…

A rare element of the chromium group, occurring in nature in the minerals molybdenite and wulfenite, and when reduced obtained as a ha…

Occurring or happening; hence, incidental; accidental.