...Its descending portion, as a whole, has a rectilinear form,and does not form a curve such as we indicated in the caseof the horse... 
Édouard Cuyer 「Artistic Anatomy of Animals」
...Four distinct types of locomotion have been described in snakes: horizontal undulatory, rectilinear, sidewinding, and concertina (Klauber, 1956: 331-350)...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...Rectigrade: larvae which, having sixteen feet, walkwith a rectilinear body...
John. B. Smith 「Explanation of Terms Used in Entomology」
...Here things happen as in a first-class reed, for the helical curve in no way affects the method of structure employed for a rectilinear series of cells...
J. Henri Fabre 「Bramble-bees and Others」
...A stone similarly cast intoempty space would pursue a course absolutely rectilinear...
Robert Stawell Ball 「The Story of the Heavens」
...The actual path is, indeed, more complicatedthan a simple rectilinear movement...
Robert Stawell Ball 「The Story of the Heavens」
...That influence, whatever it may be, constantly deflects the earth fromthe rectilinear path which it tends to pursue, and constrains it totrace out an ellipse instead of a straight line...
Robert Stawell Ball 「The Story of the Heavens」
...We have seen how the appendagesdeclined to invisibility once every fifteen years, and then graduallyreappeared in the form, at first, of rectilinear arms projectingoutwards from the planet...
Robert Stawell Ball 「The Story of the Heavens」
...A powerful disturbing influence might greatly alter the velocity of thestar; it might deflect the star from its rectilinear course; it mighteven force the star to move around a closed orbit...
Robert Stawell Ball 「The Story of the Heavens」
...Hence the moon'sdeflection from the tangential or rectilinear path every minutecomes out as very closely 16 feet (the true size of the earth beingused)...
Oliver Lodge 「Pioneers of Science」
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