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To extent in length; to make longer in extent or duration; as, to lengthen a line or a road; to lengthen life; -- sometimes followed by out. What if I please to lengthen out his date. Dryden.

A mineral of an olive-green color, commonly in orthorhombic crystals. It is a hydrous phosphate of copper.

One of a class of cellular, flowerless plants, (technically called Lichenes), having no distinction of leaf and stem, usually of scaly, expanded, frond-like forms, but sometimes erect or pendulous and variously branched. They derive their nourishment from the air, and generate by means of spores. The species are very w…

Belonging to, or covered with, lichens. Tennyson.

Of, pertaining to, or obtained from, lichens. Lichenic acid.

Having the form of a lichen.

A substance isomeric with starch, extracted from several species of moss and lichen, esp. from Iceland moss.

Of or pertaining to lichenography.

One who describes lichens; one versed in lichenography.

A description of lichens; the science which illustrates the natural history of lichens.

One versed in lichenology.

The science which treats of lichens.

Of, pertaining to, or resembling, lichens; abounding in lichens; covered with lichens. G. Eliot.

The quality or state of being lithe; flexibility; limberness.

One of a group which includes the higher orders of mammals, having a large size as a typical characteristic.

Having a typically large size; belonging to the megasthenes.

A colorless liquid hydrocarbon resembling oil of turpentine, obtained by dehydrating menthol. It has an agreeable odor and a cooling taste.

See Methylene.

The hypothetical hydrocarbon radical CH, regarded as an essential residue of certain organic compounds.

One of a group of mammals having a small size as a typical characteristic. It includes the lower orders, as the Insectivora, Cheiroptera, Rodentia, and Edentata.