English dictionary: words starting with proto - page 3

noun

The colourless material comprising the living part of a cell, including the cytoplasm, nucleus, and other organelles.

Usage examples:

It was eventually realised that the culprit was a non-cellular form of ‘life’ that could diffuse th…

adjective

Consisting of, or relating to, protoplasm (= the transparent liquid inside all living cells)

Usage examples:

The amoeba is a colourless, single-celled, jelly-like, protoplasmic organism found in sea and fresh…

noun

The protoplasm of a living plant or bacterial cell whose cell wall has been removed.

Usage examples:

In this plasmolysed cell the protoplast has suffered very intense shrinkage.

noun

The basal segments of the biramous limb or appendage of a crustacean.

Usage examples:

Crustacean biramous appendages have a basal or first portion referred to as the protopod.

noun

The basal segments of the biramous limb or appendage of a crustacean.

Usage examples:

Crustacean biramous appendages have a basal or first portion referred to as the protopod.

noun

The basal segments of the biramous limb or appendage of a crustacean.

Usage examples:

Crustacean biramous appendages have a basal or first portion referred to as the protopod.

noun

In the orthodox and eastern catholic churches: a senior priest; an archpriest.

noun

Any of a group of fifteen isomeric porphyrins having the formula c₃₄ h₃₄ n₄ o₄, in which the porphin nucleus has four methyl, two vinyl, and two propionic acid substituents; especially (more fully "protoporphyrin ix") the isomer which occurs widely in living organisms, mainly as haem (in which it is bonded to an iron atom).

noun

A polypeptide produced by partial proteolysis.

noun

A genus of dipnoan fishes comprising four african lungfishes, which have long, fringed, filamentous pectoral and pelvic fins and are usually placed in their own family, protopteridae; (also † protopterus) a fish of this genus.

noun

The primitive pyramid of a crystal system, in which the horizontal axes of the system intersect the edges of the pyramid (as opposed to one in which the axes intersect the faces midway between the edges).

noun

An early fossil reptile of the genus protorosaurus or the order protorosauria (now often called araeoscelidia).

adjective

Of, relating to, or designating fossil reptiles of the genus protorosaurus and their allies; specifically belonging to the order protorosauria.

noun

A genus of diapsid reptiles known from european fossils of the late permian period, which are among the earliest known reptiles; (also protorosaurus) a reptile of this genus.

noun

A salt in which the anion occurs in the smallest possible proportion relative to the metal cation (i.e. in which the metal occurs in its lowest oxidation state).

adjective

Of or relating to primitive science, or an early stage in the development of modern science.

noun

Originally: an early stage in fungal spore development believed to be analogous to the prothallus in ferns. in later use: specifically a uninucleate segment formed by the cleavage of a multinucleate mass of cytoplasm from which the spore or sporangium develops.

noun

A contracting mass of gas which represents an early stage in the formation of a star, before nucleosynthesis has begun.

Usage examples:

Elongated chains of dust grains like these appear in the early stages of planet formation around a …

noun

A type of stele typical of primitive plants (still found in, e.g., the seedling stages of many ferns) that lacks pith and consists of a solid core of xylem surrounded by a cylinder of phloem.

adjective

Of or relating to a protostele; possessing a protostele.

noun

A multicellular organism whose mouth develops from a primary embryonic opening, such as an annelid, mollusc, or arthropod.

Usage examples:

These animals are all protostomes - the mouth develops before the anus in the young embryo - and th…

noun

A sulphate in which the sulphate anion occurs in its smallest possible proportion relative to the other element (i.e. one in which the other element occurs in its lowest oxidation state). compare "proto-", persulphate .

noun

(in a stony coral) a cup-shaped basal skeletal plate which is formed at the start of the development of the colony.

noun

The first element in a dithematic name.

noun

Prototherian.