adder¹ /adˈər/

The only venomous snake found in Britain, a viper

addˈerstone noun

A prehistoric spindle-whorl or bead, popularly attributed to the agency of adders

adˈder's-tongue noun

1. A genus (Ophioglossum) of ferns whose spore cases grow on a spike resembling a snake's tongue
2. Dog's-tooth violet (N American)

adˈder's-wort or addˈerwort noun

The bistort or snakeweed, supposed to cure snake-bite

add /ad/

1. To put, join or annex (to something else)
2. To sum up or compute the sum of
3. To say further

1. To make an addition
2. To increase (with to)
3. To find the total of numbers, etc

addˈer noun

1. A person who adds
2. A machine for adding
3. A basic component of a chip, consisting of a number of switches which add digital signals (computing)

additament /ə-ditˈə-mənt or adˈ/ noun

1. Something added (archaic)
2. An additional ornament external to the shield, eg supporters or symbols of office (heraldry)

addiˈtion noun

1. The act of adding
2. A person or thing added
3. The part of arithmetic or algebra that deals with adding
4. A person's title or designation (Shakespeare)

addiˈtional adjective

Added

additionalˈity noun

1. The principle (orig applied to EU funding of projects) that funding should be additional to, not a replacement for, funding from the beneficiary
2. The principle that grants, credits, etc should be awarded only to promote activity that would not occur without the presence of such an incentive

addiˈtionally adverb

additiˈtious adjective

Increasing

addˈitive adjective

1. Of the nature of an addition
2. Characterized by addition
3. To be added

A substance added to foodstuffs or other commodities for a special purpose, eg as a colorant or preservative

addˈ-in noun (pl addˈ-ins) (esp computing)

An additional device or piece of software installed internally in a system to extend its capabilities

adding machine noun

An obsolete apparatus for performing basic arithmetical calculations

additional member system noun

An electoral system, used eg in the Scottish Parliament and the National Assembly for Wales, in which parties whose share of the vote is not reflected in the number of successful candidates are allowed to nominate further representatives

addition compound or addition product noun (chem)

One formed by the direct union of two or more substances

addition reaction noun (chem)

The union of two molecules to form a larger molecule with no by-products

additive-freeˈ adjective

Of food, containing no chemical additives

addˈ-on noun (pl addˈ-ons) (esp computing)

1. An additional unit, a peripheral
2. An additional charge

add-to system noun

A hire-purchase arrangement by which a customer obtains a series of articles, making a down payment on the first only

add up

1. To calculate by addition
2. To be consistent, or satisfactory to the mind
3. To point to a reasonable conclusion

add up to

1. To amount to
2. To come to as result or conclusion

in addition (to)

As well (as), besides

• gadget
• gadgeteer
• gadgeteers
• gadgetries
• gadgetry
• gadgets
• gadgety
• gadgie
• gadgies
• Gadhel
• Gadhelic
• gadi
• Gadidae
• gadis
• gadje
• gadjes
• gadling
• gadlings
• gado-gado
• gadoid
• gadoids
• gadolinite
• gadolinites
• gadolinium
• gadoliniums