Related Words

Call To Action: In an email message, the link or body copy that tells the recipient what action to take.

Protocol: A protocol is a set format for exchanging information. When you phone someone, their number must be in a set format. In one group of countries, that format is '(123) 456-7890', but in others . . . View Full Definition

Proton: A subatomic particle in the nucleus of an atom that carries a positive charge. The positively charged (+1) subatomic particle located in the atomic nucleus and having a mass slightly less th . . . View Full Definition

Proton Donor: Because a free H+ ion is technically a bare proton, acids are sometimes referred to as 'proton donors' because they release hydrogen ions in solution. The term 'proton donor' is misleading, . . . View Full Definition

Proto-Sun: An intermediate stage in the development of a star in which a large cloud of dust and gases gradually condenses through gravitational actions.

Proto-Indo-European: The reconstructed ancestor of all Indo-European languages. Many scholars use this term interchangeably with Indo-European.

Protective Factors: Strengths and resources that appear to mediate or serve as a 'buffer' against risk factors that contribute to vulnerability to maltreatment or against the negative effects of maltreatment ex . . . View Full Definition

Protective Toning: Toning process used to protect black and white prints from fading and give archival permanence. Usually used selenium or gold toners.

Protostomes: Animals in which the first opening that appears in the embryo becomes the mouth; e.g., mollusks, annelids, and arthropods.

Prototype: Term may be used differently in different situations and by different people. Usual meaning: an early build of the game (thus 'prototype' could be the first playable version, or it could be . . . View Full Definition