Conservative with word of warning referring to type of lens

Usage examples of concave.

Nearly half of the ceiling had collapsed, and the resulting pile of polyp slivers had agglutinated in an alarmingly concave wall, as though the avalanche had halted half-way through.

Major Warren assumed two things: first, that Devers had carried out his orders, crossed the long spur that jutted down almost to the stream at its deep concave bend, and then, moving south, had kept Davies in sight, if not actually in touch.

They are slightly concave, and the joints are covered by others quite convex, which come down like massive tubes from the ridge pole, and terminate at the eaves with discs on which the Tokugawa badge is emblazoned in gold, as it is everywhere on these shrines where it would not be quite out of keeping.

This commandant was a jaunty man, young to command, with a military moustache and a concave back, by name Bandal Eith Lahl.

This wall was in itself a work of art, being built of huge blocks of granite to the height of forty feet, and so fashioned that its face was concave, whereby it was rendered practically impossible for it to be scaled.

In the skull the forehead is not concave as in the gaur, but flat, and if anything rather convex.

Cordery, mechanician to the court of the Archduke Girard, tilted the small concave mirror on the brass device that rested on his workbench, catching the rays of the afternoon sun and deflecting the light through the system of lenses.

In the latter case, water charged with excrementitious and decaying matter would be slowly forced outwards, and would bathe the quadrifids, if I am right in believing that the concave lobes contract after a time like those of Dionaea.

Believe this and it surely follows, as concave implies convex, that by daily converse and association with these great ones we take their breeding, their manners, earn their magnanimity, make ours their gifts of courtesy, unselfishness, mansuetude, high seated pride, scorn of pettiness, wholesome plentiful jovial laughter.

Entwined, they moved to meet the broad concave meniscus of the water surface near the axle of the wheel.

She leaned pensively on the little open casement, and in deep thought fixed her eyes on the heaven, whose blue unclouded concave was studded thick with stars, the worlds, perhaps, of spirits, unsphered of mortal mould.

Correlated with this peculiarity the maxilla usually has the tomia sinuated, and is generally concave, and smaller and narrower than the mandible, which is also concave to receive the palatal knob.

If a spermatic cell, or spermatozooen, together with several unimpregnated ova, no matter how near to one another, if not actually touching, be placed on the concave surface of a watch-crystal, and covered with another crystal, keeping them warm, and even though the vapor of the ova envelops it, no impregnation will occur.

The curve as a whole becomes, first slightly convex to the abscissa, then straight and ascending, and lastly concave.

In this cause-and-effect curve, the first part is slightly convex to the abscissa, the second straight and ascending, and the third concave.