rectigradeadj.

Brit.

/ˈrɛktᵻɡreɪd/, U.S.

/ˈrɛktəˌɡreɪd/

Origin: Formed within English, by compounding. Etymons: recti- comb. form, -grade comb. form.

Etymology: < recti- comb. form + -grade comb. form. Compare post-classical Latin rectigradus (7th cent. in a British source), French rectigrade (1829 in the passage translated in quot. 1834), †rectograde (1801).

Zoology (now rare).

Walking with the body or limbs in a straight line; spec. †(a) (of an insect larva) not arching its body when walking (obsolete); †(b) (of a spider) having legs adapted for walking forwards (cf. laterigrade adj., saltigrade adj.) (obsolete); (c) (of a quadruped) having the limb bones arranged in a vertical plane.

ΚΠ

1825 T. Say Explan. Terms Entomol. 28 Rectigrade, larvæ, which having sixteen feet, walk with a rectilinear body.

1834 H. McMurtrie tr. G. Cuvier Animal Kingdom (abridged ed.) 312 The third section of the sedentary rectigrade [Fr. rectigrades] spiders, the Orbitelæ.

1859 R. G. Mayne Expos. Lexicon Med. Sci. (1860) 1073/2 Rectigradus,..applied to spiders which..walk always straight before them; rectigrade.

1910 Amer. Naturalist 44 548 The limbs of Diplodocus and its allies differ from the normal dinosaur type in a marked superficial and adaptive resemblance to the elephant, indicating a quadrupedal ‘rectigrade’ mode of motion.

1937 Trans. Amer. Philos. Soc. 30 320 In the taligrade type..the foot takes on the ‘rectigrade’ adaptations and is structurally ancestral to the amblypod foot.

This entry has been updated (OED Third Edition, June 2009; most recently modified version published online March 2022).

单词	rectigrade
释义	rectigradeadj. Brit. /ˈrɛktᵻɡreɪd/, U.S. /ˈrɛktəˌɡreɪd/ Origin: Formed within English, by compounding. Etymons: recti- comb. form, -grade comb. form. Etymology: < recti- comb. form + -grade comb. form. Compare post-classical Latin rectigradus (7th cent. in a British source), French rectigrade (1829 in the passage translated in quot. 1834), †rectograde (1801). Zoology (now rare). Walking with the body or limbs in a straight line; spec. †(a) (of an insect larva) not arching its body when walking (obsolete); †(b) (of a spider) having legs adapted for walking forwards (cf. laterigrade adj., saltigrade adj.) (obsolete); (c) (of a quadruped) having the limb bones arranged in a vertical plane. ΚΠ 1825 T. Say Explan. Terms Entomol. 28 Rectigrade, larvæ, which having sixteen feet, walk with a rectilinear body. 1834 H. McMurtrie tr. G. Cuvier Animal Kingdom (abridged ed.) 312 The third section of the sedentary rectigrade [Fr. rectigrades] spiders, the Orbitelæ. 1859 R. G. Mayne Expos. Lexicon Med. Sci. (1860) 1073/2 Rectigradus,..applied to spiders which..walk always straight before them; rectigrade. 1910 Amer. Naturalist 44 548 The limbs of Diplodocus and its allies differ from the normal dinosaur type in a marked superficial and adaptive resemblance to the elephant, indicating a quadrupedal ‘rectigrade’ mode of motion. 1937 Trans. Amer. Philos. Soc. 30 320 In the taligrade type..the foot takes on the ‘rectigrade’ adaptations and is structurally ancestral to the amblypod foot. This entry has been updated (OED Third Edition, June 2009; most recently modified version published online March 2022). < adj.1825
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