bald

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Lacking hair on the head.
• adjective Lacking a natural or usual covering.
• adjective Lacking treads.
• adjective Zoology Having white feathers or markings on the head, as in some birds or mammals.
• adjective Lacking ornamentation; unadorned.
• adjective Undisguised; blunt.

from The Century Dictionary.

• Wanting hair, as the head, in some part (usually the top, or front and top) where it naturally grows; partly or wholly deprived of hair on the head, as a person.
• Without the natural or usual covering of the head or top; bareheaded: as, a bald oak; a bald mountain.
• Destitute of beard or awn: as, bald wheat.
• Wanting force or meaning; meager; paltry: as, a bald sermon; a bald truism.
• Destitute of appropriate ornament; too bare, plain, or literal; unadorned; inelegant: as, “a bald translation,”
• Bare; open; undisguised.
• Having white on the face or head: specifically applied to several birds: as, the bald buzzard, eagle, etc.
• noun A natural meadow or grassy plain occurring on the rounded summit of a high mountain: a term in use in the southern extension of the Appalachian ranges, where a number of the highest knobs have their dome-shaped tops entirely bare of trees.
• An obsolete and dialectal form of bold.
• To make bald; deprive of hair.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Destitute of the natural or common covering on the head or top, as of hair, feathers, foliage, trees, etc..
• adjective Destitute of ornament; unadorned; bare; literal.
• adjective Undisguised.
• adjective obsolete Destitute of dignity or value; paltry; mean.
• adjective (Bot.) Destitute of a beard or awn.
• adjective Destitute of the natural covering.
• adjective Marked with a white spot on the head; bald-faced.
• adjective (Zoöl.) the fishhawk or osprey.
• adjective (Zoöl.) a name of the European coot (Fulica atra), alluding to the bare patch on the front of the head.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Having no hair, fur or feathers.
• adjective Of tyres: whose surface is worn away.
• adjective Of a statement: empirically unsupported.
• noun Appalachian A mountain summit or crest that lacks forest growth despite a warm climate conducive to such, as is found in many places in the Southern Appalachian Mountains.
• verb intransitive to become bald

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective lacking hair on all or most of the scalp
• adjective without the natural or usual covering
• adjective with no effort to conceal
• verb grow bald; lose hair on one's head