any of a cl-ss of organic compounds containing the group −cho, which yields acids when oxidized and alcohols when reduced.
the reactions of cellulose certainly indicate that the co- group is ketonic rather than aldehydic.
researches on cellulose c. f. cross
any organic compound containing the group -cho. aldehydes are oxidized to carboxylic acids and take part in many addition reactions
(modifier) consisting of, containing, or concerned with the group -cho: aldehyde group or radical
first oxidation product of alcohol, 1833, discovered in 1774 by german-born swedish chemist carl wilhelm scheele (1742-1786), the name said to have been coined by german chemist justus von liebig (1803-1873) from abbreviation of modern latin alcohol dehydrogenatum “dehydrogenated alcohol.”
aldehyde al·de·hyde (āl’də-hīd’)
any of a cl-ss of reactive organic chemical compounds obtained by oxidation of primary alcohols, characterized by the common group cho, and used in the manufacture of resins, dyes, and organic acids.
any of a cl-ss of highly reactive organic compounds obtained by oxidation of certain alcohols and containing the group cho. aldehydes are used in manufacturing resins, dyes, and organic acids.
- Alder buckthorn
a shrub or small tree, frangula alnus, of eurasia and northern africa, having nonedible red fruit that turns black when ripe. noun a eurasian rhamnaceous shrub, frangula alnus, with small greenish flowers and black berry-like fruits
any of several dark-colored neuropterous insects of the family sialidae, the larvae of which are aquatic and predacious on other aquatic insects.
- Alder flycatcher
a north american flycatcher, empidonax alnorum, of alder thickets and other moist areas, that has greenish-brown upper parts and whitish underparts and is almost indistinguishable except by voice from e. traillii (willow flycatcher) historical examples throat white, upperparts bright, light olive-green, without tinge of brown as in the alder flycatcher. what bird is that? frank […]
- Alder fly
any of several dark-colored neuropterous insects of the family sialidae, the larvae of which are aquatic and predacious on other aquatic insects. historical examples all trout, particularly rainbows, take an alder fly readily. chats on angling h. v. hart-davis noun any of various neuropterous insects of the widely distributed group sialoidea, such as sialis lutaria, […]
a member of a munic-p-l legislative body, especially of a munic-p-l council. noun a politically correct term for a male or female elected or appointed representative to a munic-p-l legislative body examples who is the alderperson for the fourth district? usage note politics